St.7z -

: The .7z extension indicates the file is compressed using the 7-Zip algorithm, which offers higher compression ratios than standard ZIP files.

: Fragments like "ST 7Z" have appeared in SEC filings and municipal planning documents , though these are typically coincidental alphanumeric strings rather than functional archive files. 2022-07-10 - Internet Archive

: It is sometimes used as a temporary filename for fragmented data in tools like DiscImageCreator . TOSEC full sets, 2022-07-10 - Internet Archive 2022-07-10 - Internet Archive