The Room Editor is not yet fully functional.

As with Glider PRO's Room Editor, custom backgrounds, sounds, and TV videos
are supported.

Since Glider PRO used formats that were very Mac-specific, Aerofoil has
replaced most of them with more current formats.

To add resources to a house, create a ZIP file with the extension ".gpa" with
the same name as the .gpd and .gpf files that already exist for the house.

You can add resources by adding them to a folder named as the resource type,
with the appropriate extension.

For example, for a "PICT" resource of ID "3000", create a file named "3000.bmp"
and put it in the "PICT" directory in the .gpa archive.

PICT resources, used for custom decorations and backgrounds, must be BMP files.

Sounds should go in a directory named "snd$20"
Sounds must be WAV format, monaural, 8-bit unsigned PCM, 22255 Hz.
Sounds recorded at a different sample rate will play back at the wrong speed.
Sounds that are not monaural or 8-bit unsigned PCM will fail to load.

Resource IDs must be between -32768 and 32767.  Other resource IDs will fail
to load.