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"Checksum Fail"

I´ve got the ZSNES on muy PC.
When I´ve downloaded a Rom Hack and open my Zsnes and load this rom hack it says checksum fail and it doesn´t run. I´ve tried it with other Rom hacks and there is the ckecsum fail, too. Only not hacked roms are running on my emu. So how can I make it that rom hacks are running?

sry for my bad english^^
Not sure, but the problem might be the version of the emulator you're using or the rom you downloaded.
ROM hacks? I presume those are IPS patches, which must be patched to a clean ROM.

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And for the record, the "CHKSUM: FAIL" message by itself does not mean that the ROM is corrupted. It simply means it has been edited from its original state.
Now with extra girl and extra hacker
You're playing the downloaded file, which is an IPS Patch. You need a program called Lunar IPS. You can then patch an original SMW ROM with this patch, which you can then play with ZSNES.
No, it could also be a non-clean rom that he is using to patch it. Also, I doubt he needs help as the creator of this thread is inactive