When a file extension is not associated with a program, however, you are prompted by a "How do you want to open this type of file" or "Windows can't open this file" dialog when you try to open it.

In reality, though, when you double-click on it, it would instead open in Notepad because its true, but not visible, extension is actually .txt, which corresponds to a text file.

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

Red Eye Rose received a file with a strange extension. She doesn’t know into what program she should load it. Neither does Windows. I doubt that anyone knows all of the file extensions used ...

For example, if there is an incomplete file named audiofile.mp3.crdownload, you can use a part of the sound file by removing .crdownload extension and renaming it as audiofile.mp3. You can now ...

How to open a file with a different program on your Mac When you double-click a file on your Mac, the operating system will automatically open the file using the program assigned to that type of ...

On Windows 10, it's possible to open HEIC and HEVC files, but you'll have to install a couple of free extensions, and in this guide, I'll show you how. The High-Efficiency Image File Format (HEIF ...