A BPS file is a patch containing a certain amount of changes made to an original ROM, ranging from bugfixes to translations to full hacks. By patching this file to an unmodified ROM image of SMW, the changes will be applied to the ROM. If the patch contains a hack, for example, then the ROM has now changed from the original SMW to the hack in question.
I have an IPS file, not a BPS file. What's that?
IPS files are the predecessor to BPS files. These can still be patched using Floating IPS as below.
Why use patches instead of ROMs?
Because giving away commercial ROM files is illegal. The patch contains only the differences between the full hack and the original ROM. This way, hacks can be given away legally.
How do I use a patch?
Use Floating IPS to apply a BPS patch to a clean ROM of the game that it is a hack of. Here is a tutorial on how to apply and play BPS patches.
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