1] Notepad Opening an XFDL file in Notepad is a no-brainer. Right-click on the XFDL file, hover to “Open with” in the context menu, and select Notepad. It will open the XFDL file in the ...

Need to use third-party programs to open files on your PC? Here's how to change file associations in Windows 10 and choose which apps open which file types.