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.

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 ...

Tick the checkbox next to Always use this app to open .ext files, where .ext is the extension of the file you’ve selected. E.g., .txt for text files, .jpg and .png for image files.

When you open files that have a particular file extension, Windows will look at its configuration to determine what the default program should be in order to work with these files.

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 ...

Next, open the Files app and the folder that contains the items you want to convert, then long-press on your target file. Next, select Rename from the pop-up menu, and edit the file extension to ...