...If it is a text file, it will concatenate all the printable-hex-like text that it finds on each line (until the first non-hex sequence is found) into a single string of hex digits, and then attempt to decode that string. You can feed it an existing C header file and it will decode it as long as you have all the hex strings (e.g. 0x0F, 0x0Fb2) at the beginning of each line. Commas (,) and semicolons (;) are ignored. Oh, and it's just a Rexx script - not an executable.