Yes, but nowhere can I find a description of the format of the files.

Unless you're planning on programming the files yourself, you don't need to know the file format. Just use one of the tools (such as Logo Editor or RAWerter) and paste your picture from the Windows Clipboard into that tool.

Fractal eXtreme. The wonder tool of Mandelbrot exploration.

Cool! Downloading the demo version now. Thanks!

If I can make it work, I'll give you step by step instructions on how to put a fractal into the empeg from Fractal eXtreme if you like.
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Tony Fabris