First time I've heard of that too.
Can't find the manual, so I'm left with the game's troubleshooting .txt: "Crush! uses DirectX for sound and therefore is compatible with any Windows 95, or DirectX compatible sound card." Only place that the name of an OS appears. It was released in 1997 and installs DirectX 3.0 if no newer version is present, if that helps to place the game.