It uses the LZMA/LZMA2 method to make files significantly smaller than standard ZIP archives.
The string appears to be a specific filename for a 7-Zip archive . Based on its extension, it is a compressed container likely used for transferring large folders, software updates, or grouped data. bd2b2yg.7z
While the exact contents of this specific file ("bd2b2yg") depend on where you found it, here is how you can use it and what its general features are: Key Features of a .7z Archive It uses the LZMA/LZMA2 method to make files