If you did not personally create or receive it from a trusted source, you should exercise caution before opening it:
“Generally, 7z (especially with the LZMA compression algorithm) offers better compression ratios compared to ZIP.” Microsoft Community Hub · 1 year ago So_PackG.7z
“7zip is the best file extraction tool I've come across, and it's definitely safe.” Reddit · r/skyrimmods · 8 years ago If you did not personally create or receive