Using GNU Patch: 1. Download and place GNU patch in the directory you want to patch.; 2. Type cmd in Run and tab your way to where GNU Patch is.; 3. Write patch -[parameter] < my-patch.diff; 4. The file my-patch.diff is the actual patch you want to apply.; Example: C:\Program Files\DCpp_orig>patch -p1 < my-patch.diff
C:\Program Files\DCpp_orig is the directory that is going to be patched.
p1 gives the entire file name unmodified with out a leading slash.

Parameters and more information on how to use GNU Diff can be found in the documentation for GNU Diff which should have come included with GNU Diff. Otherwise, the manual can be found at the GNU Diff manual