: Based on the "GT1.63" naming convention, this is likely:
Once extracted, if the content consists of patches (usually .tsl files), you can manage them using official tools: GT1.63_2GB.part30.rar
The file appears to be a specific segment of a multi-part RAR archive, likely containing firmware, software, or a sound library for the Go to product viewer dialog for this item. Guitar Effects Processor. How to Use This File : Based on the "GT1
If you are having trouble extracting the file, could you let me know: Do you have (part1, part2, etc.)? this is likely: Once extracted
: Use this to import and export patches from your computer to your pedal.
: A large library of user-created or professional guitar tones. Managing Content for Boss GT-1