Question for site admin: Map file names in Bnet

[Vomitus]

I have the feeling that this guy was pulling my leg, but I could not, on the spot, refute his arguments. So if someone would clear my doubts, next time I spot a modified map I can say with 100% certainty that this is not THE official battle tanks map.

If it matters hardly to you to identify a particular map you can compare downloaded file with official version byte-per-byte. File names can differ in many ways but bit stream must retain unchanged.
You can use Total Commander to compare files(File -> Compare by Content). Or even standalone tool like UltraCompare. There are dozens of these tools on the internet however.