The default setting for Windows is to not display a file's extension. Therefore, when viewing files in Windows you would only see the portion of the filename that precedes the last period in ...

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

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

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 ...

CRDOWNLOAD files are temporary files created by Chrome when you download a file from any Chromium-based browser. Learn how to open it.

These techniques—editing file extensions, changing formats, and trying different apps—will only get you so far. In order to rescue truly corrupted files, you’ll need a dedicated repair tool.