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TL;DR: Check out for dubious file extensions or files that can be used to run or .scr exploits. Also, compartmentalize your OS and software with VMs. #tldr
https://support.apple.com/guide/mac-help/show-or-hide-filename-extensions-on-mac-mchlp2304/mac
support.microsoft.comCommon file name extensions in Windows - Microsoft SupportLearn what file name extensions are, which extensions are common in Windows, and how to view them in File Explorer.