There is no "official" report for this file because it is not a standard industry term. If you found this in a suspicious email or a pop-up, it is highly likely to be . If it is part of a modding project you are working on, it likely contains graphical assets.
: Once extracted, look for executable extensions like .exe , .vbs , or .js . If a file claiming to be a "screenshot" or "document" ends in these, do not run it . ss01.rar
: In large file sets, "ss" may refer to a specific segment or "Sub-Set 01" of a larger data dump. There is no "official" report for this file