Changing the extension does not make it a PDF. How to check file types in Windows 11

You were asked to "send it as a PDF," so you changed the end of the filename from ".docx" to ".pdf" and sent it. However, the ...
Yahoo

How to Change File Extensions in Windows 11: Four Simple Methods

Add Yahoo as a preferred source to see more of our stories on Google. This guide explains how to change the file extension in Windows 11. It also clarifies the distinction between file extensions and ...
Hackaday

One File, Six Formats: Just Change The Extension

Normally, if you change a file’s extension in Windows, it doesn’t do anything positive. It just makes the file open in the wrong programs that can’t decode what’s inside. However, [PortalRunner] has ...
ZDNet

Windows 10 tip: Toggle file extensions and show hidden files with a single click

Tired of digging through dialog boxes to show file extensions and hidden files? Try adding those options from the ribbon to the Quick Access Toolbar so they're always visible. File extensions are a ...