diff --git a/Aerofoil/GpSystemServices_Win32.cpp b/Aerofoil/GpSystemServices_Win32.cpp
index 88d8e29..717a945 100644
--- a/Aerofoil/GpSystemServices_Win32.cpp
+++ b/Aerofoil/GpSystemServices_Win32.cpp
@@ -268,6 +268,16 @@ bool GpSystemServices_Win32::HasNativeFileManager() const
 	return true;
 }
 
+GpOperatingSystem_t GpSystemServices_Win32::GetOperatingSystem() const
+{
+	return GpOperatingSystems::kWindows;
+}
+
+GpOperatingSystemFlavor_t GpSystemServices_Win32::GetOperatingSystemFlavor() const
+{
+	return GpOperatingSystemFlavors::kGeneric;
+}
+
 unsigned int GpSystemServices_Win32::GetCPUCount() const
 {
 	SYSTEM_INFO sysInfo;
diff --git a/Aerofoil/GpSystemServices_Win32.h b/Aerofoil/GpSystemServices_Win32.h
index cb0f274..2d91611 100644
--- a/Aerofoil/GpSystemServices_Win32.h
+++ b/Aerofoil/GpSystemServices_Win32.h
@@ -35,6 +35,8 @@ public:
 	bool IsFullscreenPreferred() const override;
 	bool IsFullscreenOnStartup() const override;
 	bool HasNativeFileManager() const override;
+	GpOperatingSystem_t GetOperatingSystem() const override;
+	GpOperatingSystemFlavor_t GetOperatingSystemFlavor() const override;
 	unsigned int GetCPUCount() const override;
 	void SetTextInputEnabled(bool isEnabled) override;
 	bool IsTextInputEnabled() const override;
diff --git a/AerofoilAndroid/app/jni/main/GpSystemServices_Android.cpp b/AerofoilAndroid/app/jni/main/GpSystemServices_Android.cpp
index 468abba..2d20739 100644
--- a/AerofoilAndroid/app/jni/main/GpSystemServices_Android.cpp
+++ b/AerofoilAndroid/app/jni/main/GpSystemServices_Android.cpp
@@ -90,6 +90,16 @@ bool GpSystemServices_Android::HasNativeFileManager() const
 	return false;
 }
 
+GpOperatingSystem_t GpSystemServices_Android::GetOperatingSystem() const
+{
+	return GpOperatingSystems::kAndroid;
+}
+
+GpOperatingSystemFlavor_t GpSystemServices_Android::GetOperatingSystemFlavor() const
+{
+	return GpOperatingSystems::kGeneric;
+}
+
 unsigned int GpSystemServices_Android::GetCPUCount() const
 {
 	return SDL_GetCPUCount();
diff --git a/AerofoilAndroid/app/jni/main/GpSystemServices_Android.h b/AerofoilAndroid/app/jni/main/GpSystemServices_Android.h
index 881cbbf..603ea59 100644
--- a/AerofoilAndroid/app/jni/main/GpSystemServices_Android.h
+++ b/AerofoilAndroid/app/jni/main/GpSystemServices_Android.h
@@ -16,6 +16,8 @@ public:
 	bool IsFullscreenPreferred() const override;
 	bool IsFullscreenOnStartup() const override;
 	bool HasNativeFileManager() const override;
+	GpOperatingSystem_t GetOperatingSystem() const override;
+	GpOperatingSystemFlavor_t GetOperatingSystemFlavor() const override;
 	unsigned int GetCPUCount() const override;
 	void SetTextInputEnabled(bool isEnabled) override;
 	bool IsTextInputEnabled() const override;
diff --git a/AerofoilWeb/GpSystemServices_Web.cpp b/AerofoilWeb/GpSystemServices_Web.cpp
index 545fe63..6acbc8f 100644
--- a/AerofoilWeb/GpSystemServices_Web.cpp
+++ b/AerofoilWeb/GpSystemServices_Web.cpp
@@ -171,6 +171,16 @@ bool GpSystemServices_Web::HasNativeFileManager() const
 	return false;
 }
 
+GpOperatingSystem_t GpSystemServices_Web::GetOperatingSystem() const
+{
+	return GpOperatingSystems::kWeb;
+}
+
+GpOperatingSystemFlavor_t GpSystemServices_Web::GetOperatingSystemFlavor() const
+{
+	return GpOperatingSystems::kGeneric;
+}
+
 unsigned int GpSystemServices_Web::GetCPUCount() const
 {
 	return SDL_GetCPUCount();
diff --git a/AerofoilWeb/GpSystemServices_Web.h b/AerofoilWeb/GpSystemServices_Web.h
index 4aafd63..03fb41f 100644
--- a/AerofoilWeb/GpSystemServices_Web.h
+++ b/AerofoilWeb/GpSystemServices_Web.h
@@ -19,6 +19,8 @@ public:
 	bool IsFullscreenPreferred() const override;
 	bool IsFullscreenOnStartup() const override;
 	bool HasNativeFileManager() const override;
+	GpOperatingSystem_t GetOperatingSystem() const;
+	GpOperatingSystemFlavor_t GetOperatingSystemFlavor() const;
 	unsigned int GetCPUCount() const override;
 	void SetTextInputEnabled(bool isEnabled) override;
 	bool IsTextInputEnabled() const override;
diff --git a/AerofoilX/GpSystemServices_X.cpp b/AerofoilX/GpSystemServices_X.cpp
index 80f5247..98ebaed 100644
--- a/AerofoilX/GpSystemServices_X.cpp
+++ b/AerofoilX/GpSystemServices_X.cpp
@@ -99,6 +99,16 @@ bool GpSystemServices_X::HasNativeFileManager() const
 	return true;
 }
 
+GpOperatingSystem_t GpSystemServices_X::GetOperatingSystem() const
+{
+	return GpOperatingSystems::kLinux;
+}
+
+GpOperatingSystemFlavor_t GpSystemServices_X::GetOperatingSystemFlavor() const
+{
+	return GpOperatingSystems::kGeneric;
+}
+
 unsigned int GpSystemServices_X::GetCPUCount() const
 {
 	return SDL_GetCPUCount();
diff --git a/AerofoilX/GpSystemServices_X.h b/AerofoilX/GpSystemServices_X.h
index 704eeab..b694568 100644
--- a/AerofoilX/GpSystemServices_X.h
+++ b/AerofoilX/GpSystemServices_X.h
@@ -19,6 +19,8 @@ public:
 	bool IsFullscreenPreferred() const override;
 	bool IsFullscreenOnStartup() const override;
 	bool HasNativeFileManager() const override;
+	GpOperatingSystem_t GetOperatingSystem() const override;
+	GpOperatingSystemFlavor_t GetOperatingSystemFlavor() const override;
 	unsigned int GetCPUCount() const override;
 	void SetTextInputEnabled(bool isEnabled) override;
 	bool IsTextInputEnabled() const override;
diff --git a/GpApp/Externs.h b/GpApp/Externs.h
index 2be06cc..abb4ac7 100644
--- a/GpApp/Externs.h
+++ b/GpApp/Externs.h
@@ -76,6 +76,7 @@ namespace PortabilityLayer
 #define iCoordinateWindow		21
 
 #define iExportGliderPROHouse	1
+#define iDownloadHouse			2
 
 //--------------------------------------------------------------  Structs
 /*
diff --git a/GpApp/GliderProtos.h b/GpApp/GliderProtos.h
index 2f4aa90..0b7be6c 100644
--- a/GpApp/GliderProtos.h
+++ b/GpApp/GliderProtos.h
@@ -120,12 +120,12 @@ void DoGoToDialog (void);
 void ConvertHouseVer1To2 (void);
 void ShiftWholeHouse (SInt16);
 void ExportHouse (void);
+void DownloadHouse (void);
 
 void DoHouseInfo (void);								// --- HouseInfo.c
 
 Boolean OpenHouse (Boolean load);						// --- HouseIO.c
 Boolean OpenSpecificHouse (const VFileSpec &);
-Boolean SaveHouseAs (void);
 Boolean ReadHouse (GpIOStream *houseStream, bool untrusted);
 Boolean WriteHouse (Boolean);
 Boolean CloseHouse (void);
diff --git a/GpApp/HouseIO.cpp b/GpApp/HouseIO.cpp
index 966b9b7..37e2985 100644
--- a/GpApp/HouseIO.cpp
+++ b/GpApp/HouseIO.cpp
@@ -25,6 +25,8 @@
 #include "PLStringCompare.h"
 #include "PLPasStr.h"
 
+#include "CombinedTimestamp.h"
+#include "DeflateCodec.h"
 #include "MacFileInfo.h"
 #include "GpIOStream.h"
 #include "GpVector.h"
@@ -32,6 +34,7 @@
 #include "QDPictOpcodes.h"
 #include "QDPixMap.h"
 #include "PLStandardColors.h"
+#include "ZipFile.h"
 
 #define kSaveChangesAlert		1002
 #define kSaveChanges			1
@@ -3515,10 +3518,16 @@ ExportHouseResult_t TryExportHouseToStream(GpIOStream *stream)
 	ByteSwapHouse(house, houseSize, true);
 
 	if (!stream->WriteExact(house, houseType::kBinaryDataSize))
+	{
+		ByteSwapHouse(house, houseSize, false);
 		return ExportHouseResults::kIOError;
+	}
 
 	if (!stream->WriteExact(house->rooms, sizeof(roomType) * nRooms))
+	{
+		ByteSwapHouse(house, houseSize, false);
 		return ExportHouseResults::kIOError;
+	}
 
 	ByteSwapHouse(house, houseSize, false);
 
@@ -3610,3 +3619,218 @@ void ExportHouse(void)
 		break;
 	}
 }
+
+ExportHouseResult_t TryDownloadHouseToStream(GpIOStream *stream)
+{
+	PortabilityLayer::MacFileProperties mfp;
+	mfp.m_createdTimeMacEpoch = PLDrivers::GetSystemServices()->GetTime();
+	memcpy(mfp.m_fileCreator, "ozm5", 4);
+	memcpy(mfp.m_fileType, "gliH", 4);
+	mfp.m_finderFlags = 0;
+	mfp.m_modifiedTimeMacEpoch = mfp.m_createdTimeMacEpoch;
+	mfp.m_protected = 0;
+	mfp.m_xPos = 0;
+	mfp.m_yPos = 0;
+
+	PortabilityLayer::MacFilePropertiesSerialized mfps;
+	mfps.Serialize(mfp);
+
+	unsigned int year, month, day, hour, minute, second;
+	PortabilityLayer::CombinedTimestamp ts;
+	PLDrivers::GetSystemServices()->GetLocalDateTime(year, month, day, hour, minute, second);
+
+	ts.SetLocalYear(year);
+	ts.m_localDay = day;
+	ts.m_localHour = hour;
+	ts.m_localMinute = minute;
+	ts.m_localMonth = month;
+	ts.m_localSecond = second;
+
+	uint16_t dosDate, dosTime;
+	ts.GetAsMSDOSTimestamp(dosDate, dosTime);
+
+	const uint32_t metaSize = sizeof(mfps.m_data);
+	const uint32_t metaCRC = PortabilityLayer::DeflateContext::CRC32(0, mfps.m_data, metaSize);
+
+	const char *metaPackagedName = PortabilityLayer::MacFilePropertiesSerialized::GetPackagedName();
+	GpUFilePos_t metaLHPos = 0;
+	PortabilityLayer::ZipFileLocalHeader metaLH;
+	metaLH.m_signature = PortabilityLayer::ZipFileLocalHeader::kSignature;
+	metaLH.m_versionRequired = PortabilityLayer::ZipConstants::kStoredRequiredVersion;
+	metaLH.m_flags = 0;
+	metaLH.m_method = PortabilityLayer::ZipConstants::kStoredMethod;
+	metaLH.m_modificationTime = dosTime;
+	metaLH.m_modificationDate = dosDate;
+	metaLH.m_crc = metaCRC;
+	metaLH.m_compressedSize = metaSize;
+	metaLH.m_uncompressedSize = metaSize;
+	metaLH.m_fileNameLength = strlen(metaPackagedName);
+	metaLH.m_extraFieldLength = 0;
+
+	if (!stream->WriteExact(&metaLH, sizeof(metaLH)))
+		return ExportHouseResults::kIOError;
+
+	if (!stream->WriteExact(metaPackagedName, strlen(metaPackagedName)))
+		return ExportHouseResults::kIOError;
+
+	if (!stream->WriteExact(mfps.m_data, metaSize))
+		return ExportHouseResults::kIOError;
+
+	houseType *house = *thisHouse;
+	const size_t houseSize = thisHouse.MMBlock()->m_size;
+	const size_t nRooms = house->nRooms;
+	const size_t houseDataSize = houseType::kBinaryDataSize + sizeof(roomType) * nRooms;
+
+	ByteSwapHouse(house, houseSize, true);
+
+	uint32_t houseCRC = PortabilityLayer::DeflateContext::CRC32(0, house, houseType::kBinaryDataSize);
+	houseCRC = PortabilityLayer::DeflateContext::CRC32(houseCRC, house->rooms, sizeof(roomType) * nRooms);
+
+	const uint32_t totalhouseSize = houseType::kBinaryDataSize + sizeof(roomType) * nRooms;
+
+	GpUFilePos_t houseLHPos = 0;
+
+	const char *dataPackagedName = "!data";
+
+	PortabilityLayer::ZipFileLocalHeader houseLH;
+	houseLH.m_signature = PortabilityLayer::ZipFileLocalHeader::kSignature;
+	houseLH.m_versionRequired = PortabilityLayer::ZipConstants::kStoredRequiredVersion;
+	houseLH.m_flags = 0;
+	houseLH.m_method = PortabilityLayer::ZipConstants::kStoredMethod;
+	houseLH.m_modificationTime = dosTime;
+	houseLH.m_modificationDate = dosDate;
+	houseLH.m_crc = houseCRC;
+	houseLH.m_compressedSize = totalhouseSize;
+	houseLH.m_uncompressedSize = totalhouseSize;
+	houseLH.m_fileNameLength = strlen(dataPackagedName);
+	houseLH.m_extraFieldLength = 0;
+
+	if (!stream->WriteExact(&houseLH, sizeof(houseLH)))
+	{
+		ByteSwapHouse(house, houseSize, false);
+		return ExportHouseResults::kIOError;
+	}
+
+	if (!stream->WriteExact(dataPackagedName, strlen(dataPackagedName)))
+	{
+		ByteSwapHouse(house, houseSize, false);
+		return ExportHouseResults::kIOError;
+	}
+
+	if (!stream->WriteExact(house, houseType::kBinaryDataSize))
+	{
+		ByteSwapHouse(house, houseSize, false);
+		return ExportHouseResults::kIOError;
+	}
+
+	if (!stream->WriteExact(house->rooms, sizeof(roomType) * nRooms))
+	{
+		ByteSwapHouse(house, houseSize, false);
+		return ExportHouseResults::kIOError;
+	}
+
+	ByteSwapHouse(house, houseSize, false);
+
+	GpUFilePos_t cdirStart = stream->Tell();
+
+	PortabilityLayer::ZipCentralDirectoryFileHeader metaCDir;
+	metaCDir.m_signature = PortabilityLayer::ZipCentralDirectoryFileHeader::kSignature;
+	metaCDir.m_versionCreated = PortabilityLayer::ZipConstants::kCompressedRequiredVersion;;
+	metaCDir.m_versionRequired = PortabilityLayer::ZipConstants::kStoredRequiredVersion;
+	metaCDir.m_flags = 0;
+	metaCDir.m_method = PortabilityLayer::ZipConstants::kStoredMethod;
+	metaCDir.m_modificationTime = dosTime;
+	metaCDir.m_modificationDate = dosDate;
+	metaCDir.m_crc = metaCRC;
+	metaCDir.m_compressedSize = metaSize;
+	metaCDir.m_uncompressedSize = metaSize;
+	metaCDir.m_fileNameLength = strlen(metaPackagedName);
+	metaCDir.m_extraFieldLength = 0;
+	metaCDir.m_commentLength = 0;
+	metaCDir.m_diskNumber = 0;
+	metaCDir.m_internalAttributes = 0;
+	metaCDir.m_externalAttributes = PortabilityLayer::ZipConstants::kArchivedAttributes;
+	metaCDir.m_localHeaderOffset = static_cast<uint32_t>(metaLHPos);
+
+	if (!stream->WriteExact(&metaCDir, sizeof(metaCDir)))
+		return ExportHouseResults::kIOError;
+
+	if (!stream->WriteExact(metaPackagedName, strlen(metaPackagedName)))
+		return ExportHouseResults::kIOError;
+
+	PortabilityLayer::ZipCentralDirectoryFileHeader dataCDir;
+	dataCDir.m_signature = PortabilityLayer::ZipCentralDirectoryFileHeader::kSignature;
+	dataCDir.m_versionCreated = PortabilityLayer::ZipConstants::kCompressedRequiredVersion;;
+	dataCDir.m_versionRequired = PortabilityLayer::ZipConstants::kStoredRequiredVersion;
+	dataCDir.m_flags = 0;
+	dataCDir.m_method = PortabilityLayer::ZipConstants::kStoredMethod;
+	dataCDir.m_modificationTime = dosTime;
+	dataCDir.m_modificationDate = dosDate;
+	dataCDir.m_crc = metaCRC;
+	dataCDir.m_compressedSize = houseDataSize;
+	dataCDir.m_uncompressedSize = houseDataSize;
+	dataCDir.m_fileNameLength = strlen(dataPackagedName);
+	dataCDir.m_extraFieldLength = 0;
+	dataCDir.m_commentLength = 0;
+	dataCDir.m_diskNumber = 0;
+	dataCDir.m_internalAttributes = 0;
+	dataCDir.m_externalAttributes = PortabilityLayer::ZipConstants::kArchivedAttributes;
+	dataCDir.m_localHeaderOffset = static_cast<uint32_t>(houseLHPos);
+
+	if (!stream->WriteExact(&dataCDir, sizeof(dataCDir)))
+		return ExportHouseResults::kIOError;
+
+	if (!stream->WriteExact(dataPackagedName, strlen(dataPackagedName)))
+		return ExportHouseResults::kIOError;
+
+	PortabilityLayer::ZipEndOfCentralDirectoryRecord eocd;
+	eocd.m_signature = PortabilityLayer::ZipEndOfCentralDirectoryRecord::kSignature;
+	eocd.m_thisDiskNumber = 0;
+	eocd.m_centralDirDisk = 0;
+	eocd.m_numCentralDirRecordsThisDisk = 2;
+	eocd.m_numCentralDirRecords = 2;
+	eocd.m_centralDirectorySizeBytes = static_cast<uint32_t>(stream->Tell() - cdirStart);
+	eocd.m_centralDirStartOffset = static_cast<uint32_t>(cdirStart);
+	eocd.m_commentLength = 0;
+
+	if (!stream->WriteExact(&eocd, sizeof(eocd)))
+		return ExportHouseResults::kIOError;
+
+	return ExportHouseResults::kOK;
+}
+
+ExportHouseResult_t TryDownloadHouse(void)
+{
+	GpIOStream *stream = nullptr;
+	if (PortabilityLayer::FileManager::GetInstance()->OpenNonCompositeFile(PortabilityLayer::VirtualDirectories::kSourceExport, thisHouseName, ".gpf", PortabilityLayer::EFilePermission_Write, GpFileCreationDispositions::kCreateOrOverwrite, stream))
+		return ExportHouseResults::kStreamFailed;
+
+	ExportHouseResult_t result = TryDownloadHouseToStream(stream);
+	stream->Close();
+
+	return result;
+}
+
+void DownloadHouse(void)
+{
+	ExportHouseResult_t result = TryDownloadHouse();
+
+	switch (result)
+	{
+	case ExportHouseResults::kOK:
+		break;
+	case ExportHouseResults::kMemError:
+		YellowAlert(kYellowNoMemory, 0);
+		break;
+	case ExportHouseResults::kInternalError:
+		YellowAlert(kYellowUnaccounted, 0);
+		break;
+	case ExportHouseResults::kIOError:
+	case ExportHouseResults::kStreamFailed:
+		YellowAlert(kYellowFailedWrite, 0);
+		break;
+	case ExportHouseResults::kResourceError:
+		YellowAlert(kYellowFailedResOpen, 0);
+		break;
+	}
+}
diff --git a/GpApp/InterfaceInit.cpp b/GpApp/InterfaceInit.cpp
index c1296de..ed83d89 100644
--- a/GpApp/InterfaceInit.cpp
+++ b/GpApp/InterfaceInit.cpp
@@ -9,6 +9,7 @@
 #include "Externs.h"
 #include "Environ.h"
 #include "IGpDisplayDriver.h"
+#include "IGpSystemServices.h"
 #include "GpApplicationName.h"
 #include "Map.h"
 #include "MenuManager.h"
@@ -79,8 +80,9 @@ void InitializeMenus (void)
 	if (houseMenu == nil)
 		RedAlert(kErrFailedResourceLoad);
 
-	exportMenu = mm->CreateMenu(PSTR("Export"), kExportMenuID, true, 100, 16, 0);
+	exportMenu = mm->CreateMenu(PSTR("Import/Export"), kExportMenuID, true, 100, 16, 0);
 	mm->AppendMenuItem(exportMenu, 0, 0, 0, 0, true, false, PSTR("Export Glider PRO\xaa House..."));
+	mm->AppendMenuItem(exportMenu, 0, 0, 0, 0, false, false, PSTR("Download House..."));
 	
 	UpdateMenus(false);
 }
diff --git a/GpApp/Menu.cpp b/GpApp/Menu.cpp
index 6b5d8da..2422581 100644
--- a/GpApp/Menu.cpp
+++ b/GpApp/Menu.cpp
@@ -6,7 +6,7 @@
 //============================================================================
 
 
-//#include <Balloons.h>
+#include "PLDrivers.h"
 #include "PLNumberFormatting.h"
 #include "PLKeyEncoding.h"
 #include "PLHacks.h"
@@ -17,6 +17,7 @@
 #include "Externs.h"
 #include "Environ.h"
 #include "House.h"
+#include "IGpSystemServices.h"
 #include "MenuManager.h"
 #include "ObjectEdit.h"
 
@@ -143,9 +144,17 @@ void UpdateMenusHouseOpen (void)
 	}
 
 	if (houseUnlocked)
+	{
 		EnableMenuItem(exportMenu, iExportGliderPROHouse);
+		if (PLDrivers::GetSystemServices()->GetOperatingSystem() == GpOperatingSystems::kWeb)
+			EnableMenuItem(exportMenu, iDownloadHouse);
+	}
 	else
+	{
 		DisableMenuItem(exportMenu, iExportGliderPROHouse);
+		if (PLDrivers::GetSystemServices()->GetOperatingSystem() == GpOperatingSystems::kWeb)
+			DisableMenuItem(exportMenu, iDownloadHouse);
+	}
 }
 
 //--------------------------------------------------------------  UpdateMenusHouseClosed
@@ -486,6 +495,9 @@ void DoExportMenu(short theItem)
 	case iExportGliderPROHouse:
 		ExportHouse();
 		break;
+	case iDownloadHouse:
+		DownloadHouse();
+		break;
 	};
 }
 
diff --git a/GpCommon/IGpSystemServices.h b/GpCommon/IGpSystemServices.h
index 76f64ac..98999b8 100644
--- a/GpCommon/IGpSystemServices.h
+++ b/GpCommon/IGpSystemServices.h
@@ -14,6 +14,34 @@ struct IGpMutex;
 struct IGpThreadEvent;
 struct IGpClipboardContents;
 
+namespace GpOperatingSystems
+{
+	enum GpOperatingSystem
+	{
+		kUnknown,
+
+		kWindows,
+		kAndroid,
+		kWeb,
+		kLinux,
+		kMacOS,
+		kIOS,
+	};
+}
+
+typedef GpOperatingSystems::GpOperatingSystem GpOperatingSystem_t;
+
+namespace GpOperatingSystemFlavors
+{
+	enum GpOperatingSystemFlavor
+	{
+		kGeneric,
+	};
+}
+
+typedef GpOperatingSystemFlavors::GpOperatingSystemFlavor GpOperatingSystemFlavor_t;
+
+
 struct IGpSystemServices
 {
 public:
@@ -33,6 +61,8 @@ public:
 	virtual bool IsFullscreenOnStartup() const = 0;
 	virtual bool IsTextInputObstructive() const = 0;
 	virtual bool HasNativeFileManager() const = 0;
+	virtual GpOperatingSystem_t GetOperatingSystem() const = 0;
+	virtual GpOperatingSystemFlavor_t GetOperatingSystemFlavor() const = 0;
 	virtual unsigned int GetCPUCount() const = 0;
 	virtual void SetTextInputEnabled(bool isEnabled) = 0;
 	virtual bool IsTextInputEnabled() const = 0;