Yt1.7z -

(e.g., a specific website or video link)? What is the approximate file size ?

: Compressed folders containing video assets for a specific channel or project. YT1.7z

If you are trying to manage or open this file, here are the safest ways to proceed: it often appears in:

: Some developers name their personal tool archives YT1 , YT2 , etc. YT1.7z

While "YT1" isn't a standard tech term, it often appears in: