I knew at one time, but I have forgotten now.
It's a "character flaw" of Mowgli that he uses weird, like cartographic software (or SOME kind, anyway) that saves things in a format that no normal human can decipher, and he feels some obscure need to upload the files to ENWorld in this same format, rather than using something simple, like a plain text word processor, like Word, that everyone can see easily. But we still love his big, goofy ass!