F.3.a.r. Iso & Xex - Xbox 360 [region Free] Instant

In the context of the Xbox 360 homebrew and modding scene, these file types mean:

Indicates the game will run on consoles from any region (NTSC, NTSC-J, or PAL). F.3.A.R. ISO & XEX - Xbox 360 [Region Free]

A standard disk image file that can be burned to a DVD or used with certain hardware emulators. In the context of the Xbox 360 homebrew