Happy patching!

This process is called , and it’s easier than it sounds. Here’s everything you need to know. What is an XDelta Patch? An XDelta patch is a file that contains only the differences between an original (source) file and a modified (target) file.

If you’ve ever downloaded a fan translation for a retro game, a ROM hack, or an update for a piece of software, you’ve likely encountered a file with the extension .xdelta (or .vcdiff ). Unlike a standard .zip or .exe , you can’t just double-click it. Instead, you need to apply it to an original file.