mlvernik:
Seems you just rename the patch(XXX.diff) to XXX, then put it on. The patched file is used for patching the source. You should put the patch files(with their original name) into the correct dirs and apply the patch by “patch origfile patch”.
If you don’t know how to patch, you can also download the patched file in the following url:
Patch for WordPress 2.0 trackback issue