What file is invalid?
If you mean the download on page one, I just checked it and it works fine.
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this emulator is the best on DS!
I have a question - how do you change roms region? I want to play Power Strike II in EU (50hz) mode.
This emulator has a weird bug. When playing it on my Games n' Music it didn't work. Take the card out and set your DSs' time to 0:00 and it should work, hope this helps somebody.
thx for your work