If you cannot open an Excel file and see Excel cannot open the file because the file format or extension is not valid error, see this post.

Sometimes, when you try to open a Word file it fails to open and displays the following message – Word cannot open the file because the file format does not match the file extension.

If you can't open a file on your computer, don't give up right away. These tricks will give you a fighting chance of accessing or recovering its contents.

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. Ho… ...

To access any given file, you may need to convert it to a new format. For example, something your colleague created on a macOS word processor might not work on your Windows 10 computer.

SVG is short for Scalable Vector Graphics, a resolution-independent file format for images like logos and diagrams.