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DFI image file format:

32-byte header
16-byte padding
MBR-partitioned disk image
FAT16 filesystem


CE.CEX format:
Weird. Looks like a debian archive, but it's not. More specifically, it appears to be a debian archive header that's been overwritten with other values in certain places:

64-byte header with overwrite at 0x10-0x13 and 0x30-0x37, with the actual data payload starting at 0x40 instead of 0x44

0x10-0x13 contains the hex value '27 5b c9 47', or '[EG in ascii

The useful bits are at offset 0x30-0x37, two little-endian encoded int32 sizes (including headers), representing the sizes of the two chunks in the file:

First chunk is a 64-byte header (since it includes the file header) and a tar.gz

Second chunk is an empty debian archive.