songdata.mml in wondows 7

hello, newb here. I was following nullsoft's guide to using mck/mml and came to the part about renaming the text file to "songdata.mml". I ended up changing the extension to .mml. In windows 7 it turns into a media catalog file.

How does this work in windows 7? Is it just "songdata.mml.txt"? I want to learn mml to make nsf chiptunes. Can I do that in windows 7? Can someone point me in the proper direction to where I can start learning?

EDIT: nevarmind, I did some s'perimenting, and it turned out fine. I was able to create an nsf using the file with the .mml extension.

If it "turns into a media catalog file", that's because Windows can't tell the difference between a media catalog file and a chiptune score source code file (both .mml), just as it can't tell the difference between an Authenticode certificate and a compiled Super NES score (both .spc). The score compiler can tell the difference, and that's enough, as you discovered.