Description: find the key, and they gave us the following file which revealed to be a gzipped raw disk image.
First analysis
After extracting, use the file command to recognize a raw disk image:
$ file f100_6db079ca91c4860f.bin f100_6db079ca91c4860f.bin: x86 boot sector; partition 1: ID=0x7, starthead 0, startsector 31, 31558 sectors