AudioVision CD or the shorthand AVCD is a format I stumbled across getting lost down a rabbithole of formats on discogs.com when researching CD-i discs.
What is an AVCD?
Like CD-i Ready, AVCD stores data in audio Track 1's pregap, though interestingly the discs are specifically Mac friendly, featuring a HFS filesystem - though the disc I picked up (Techno-Squid Parliment self-titled) also includes a windows installer.exe.
Of course at that point in history, we should remember that QuickTime (Apple software) was often the dominant video technology to distribute even on the more popular Enhanced CDs.
Most AVCD's in the discogs format filter, ARE IN FACT NOT AVCD's, but don't let that stop you from a fun afternoon hunt. Here's a few clues in case you're interested in building another obscure format collection.
For clarification - these discs are not Philips CD-i related, just another obscure Philips format. However the audio tracks will play well enough on the CD-i player as all Redbook audio does.