Notes about the GAS 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 GAS file type is primarily associated with 'Grab-a-Site' by BlueSquirrel. Grab-a-Site 5.0 is a file-based offline browser that can download an entire Web site while retaining the original filenames and directory structure.