Lost Windows Media Center WT games.
From The Lost Media Wiki
These two games: Gem Master 3 and Otto's Magic Blocks had a Media Center edition, which added remote control support and higher audio quality, additional assets for remote. These were available only in XP Media Center. The shortcuts for these games were preinstalled with MC, but the games itself were needed to be downloaded for free (only if MC was installed). Microsoft deleted the download page and these game versions are now lost. If you still have them installed and working in MC, try to archive them.