Notes about the GB1 file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The GB1 file type is primarily associated with 'Game Maker' by YoYo Games Limited. Game Maker allows you to make computer games, without the need to write a single line of code. You can make games with backgrounds, animated graphics, music and sound effects, and even 3D games. Game Maker was written by Mark Overmars. He is a full professor at the Institute of Information and Computing Sciences at Utrecht University in the Netherlands. On Feb 28 2007 version 7.0 of Game Maker was released through the YoYo Games website. The .GB1 file is automatically created while you edit a saved game in any version of Game Maker. If you want to open this in Game Maker in the Open dialog box, select Backup from the list of files to see.