I found this a bit odd.
I downloaded The 12th Weekly Power-User Challenge (November 3rd, 2017) - Revision of an Imported Body submission by Thomas Voetmann and wanted to see what version SW was used. I unzipped and looked at the Last Saved With column in Windows Explorer and got this...
The computer I used only has SW2013, SW2014 & SW2015 versions installed.
Question, where does the Last Saved With information come from? I assumed it would be embedded in the file header , but apparently not.