If your goal is simply to play backups, you have options that skip the XEX conversion step entirely.
Search for "Xbox 360 Image Browser v2.9" (ensure you download from reputable homebrew sites, not random ads).
Beginners who want a "set it and forget it" experience.
: Create a new folder on your desktop or external drive. This is where the extracted files (including the default.xex ) will go.