Several users have reported a problem where Firefox 1.5 has problems properly recognizing that files with the .dmg.gz extension (disk images that have been compressed using gzip). For the problematic ...

File Synchronization v1.2.4 is a file/folder synchronization tool. Version 1.2.4 fixes a bug where trying to register the application would crash it. DMG Maker 2.0.3 is a disk image creation utility ...

Well, there is room for X to be told to handle each file a separate way, even though they have the same extension. Assuming the file itself is okay, use the Get Info pane to tell the OS to use Disk ...