To make this piece "useful," you cannot open it individually. You must follow these steps to extract the full content:
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 GT1.63_2GB.part30.rar
If the extracted files are guitar patches, this guide shows you how to import them into your device using Boss Tone Studio: Boss GT-1 Tutorial - How to Import & Export Patches GuitarNTabs YouTube• Jul 14, 2022 To make this piece "useful," you cannot open it individually