Your are out of luck as editor only supports .bmp, .png, and .jpg. The image engine in the remote is based off libpng.
Note that .gif files are also not supported so the ability to use animated GIF is out of the question as well.

Jpeg files are import-only into the editor. The file that actually gets saved inside your config file is a 24-bit .bmp version of the Jpeg. Note that .xcf file is nothing more than a zip file with different extension.