XCF (GIMP - eXperimental Computing Facility)

The XCF, or eXperimental Computing Facility format, is a raster image file format native to the GIMP image processing application, which is a freely available program used for photo retouching, composition, and authoring.

XCF files, along with containing raw raster image data, contain additional information for defining image layers, channels, paths, and other data. The GIMP application is still under development and is available to download for Windows.