Since .7z files can execute scripts once unpacked, keep these precautions in mind:
: Often, alphanumeric codes like "BFSG" refer to "Best Full Set Games" or specific region-coded collections for emulators like RetroArch or MAME. "21" could refer to the year 2021 or a specific version number. BFSG21.7z
To see what is actually inside the file, you will need a utility that can handle the .7z (7-Zip) format. : Use 7-Zip (Official) for Windows or The Unarchiver for Mac
: Use 7-Zip (Official) for Windows or The Unarchiver for Mac. Extract : Right-click the file and select "Extract here." : Most creators include a readme
I can give you much more specific details if I know the context!
: Always run the file through a service like VirusTotal before opening.
: Most creators include a readme.txt or metadata.json inside the archive that explains the versioning and usage instructions. Safety & Security Tips