Download tracking by ISP

What's up Romulation Community.
In the past I have received warning letters from my ISP (U.S. based company)because I was downloading a homebrew game from a filesharing program. I guess they were monitoring the file extensions going in and out. Do you know if the homebrew files you provide are in any way tracked by BIG BROTHER? Your help answering this question is appreciated.
----My thoughts are they can ONLY track the file extension.....so rar or zip files should be OK....Keep on rockin ROMULATION.

well you should reply the warning letter saying "Homebrew is freeware and fanmade"

the peer to peer network you were using was monitored, and they sent you a letter because you were seen on that network, regardless of the fact the file you were downloading was legal.