Some file types rely on an extension more heavily. For example, an XLSX file is a type of compressed file, so the extension is important. Without it, an app like xdg-open wonâ t do quite what ...

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.

See file, folder and extension. A Folder Hierarchy In this Windows example, Program Files is a folder, and Adobe is one of the many subfolders within Program Files.

An entire section of the preferences has been devoted to this. All you have to do is type in the file extension (i.e. .sit) that you want Speed Download to get and press “Save.” ...