Hi yeslamthatstupid,
Could you please take a check of the file extensions?
Open folder options and uncheck the hide file extensions on the view tab.
And if available, share us the screenshot.
For the files can't open correctly, there might be the compatibility issue between the file formats, see:
https://support.office.com/en-us/article/Open-a-Word-2016-or-2013-document-in-an-earlier-version-of-Word-45c4dd2f-bf7b-4a0d-9ff2-7b2ff6b733f0
Further, you may also consider to ask in the office forum, see if they could offer any further assistance:
https://social.technet.microsoft.com/Forums/office/en-US/home?category=officeitpro
Regards
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