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How to Show or Hide File Extensions in Windows 10

By default, File Explorer in Windows 10 does not show the file extension for most file types. This is a security risk as anyone could send you a malicious file named "Runme.txt.exe" but Windows will hide the .exe portion, so an inexperienced user can inadvertently open the file thinking that it is a text file and malware will infect his or her PC.

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