Red Eye Rose received a file with a strange extension. She doesn't know into what program she should load it. Neither does Windows.

How to Open Unrecognized File Extensions. In most cases, the majority of the file extensions you encounter on your computer are already associated with a program or protocol. When a file extension ...

Need to look at invisible files and show hidden file extensions in Windows? Here's how to reveal them.

In the Mac OS it is possible to change the default program the operating system will use to open a file when you double-click on it. After you have changed this file association, though, you may ...

How to restore your default file extension associations in Mac OS In the Mac OS it is possible to change the default program the operating system will use to open a file when you double-click on ...

You can create a file without a File Type Extension in Windows 11/10 by carefully following the steps laid down in this post.

Learn how to rename all file extensions in a folder & sub-folders at once on Windows 11/10. You can batch rename or rename all file extensions in bulk using this guide.