: The .7z format, particularly using the LZMA and LZMA2 algorithms, generally offers better compression than standard ZIP or RAR formats, making it ideal for large datasets.
If was found on a random website or sent via an unsolicited message: gluingtarp.7z
If you have encountered this specific file, here is a general review of what to expect from a .7z archive and how to handle it safely: Technical Performance of .7z : The .7z format