I probably should have posted this before, but if you want to get the full cygwin (which I recommend), you can get it from one of the mirrors listed here:
http://cygwin.com/mirrors.html

For quick downloading, just click here.

According to the package list (http://cygwin.com/packages/), both diff and patch are included. Also included is bash (a better shell than cmd) and gcc for compiling. The version of cygwin that I have installed is older, so YMMV, but you'll probably be happy.

And, as always, you can get the source code to any of the GNU software from one of the mirrors listed at http://www.gnu.org/prep/ftp.html

Well here is a test diff file for drawde's 0.8 up to my changes tonight. The diff ran fine, but I am having trouble trying to get patch to apply the changes.

I get:
C:\Amusement Park\games\EQNPC\Diff>patch -p1 < patchfile
can't find file to patch at input line 4
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
--------------------------
|diff -Naur Drawde0.8/EQSpawns.txt Lurker0.3/EQSpawns.txt
|--- Drawde0.8/EQSpawns.txt Sun Apr 07 17:09:52 2002
|+++ Lurker0.3/EQSpawns.txt Thu Apr 18 01:59:26 2002
--------------------------
File to patch:
C:\Amusement Park\games\EQNPC\Diff>


Or:
C:\Amusement Park\games\EQNPC\Diff\Drawde0.8>patch -p1 < patchfile
patching file EQSpawns.txt
missing header for unified diff at line 10 of patch
can't find file to patch at input line 10
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
--------------------------
|-1,4 +1,4 @@
|-NumNPCs 5617
|+NumNPCs 5611
| Aagron EasternPlainsofKarana 35 2010 0 0 3 Human 311 5 Warrior 0 1 -636 -52 3
| Aanina_Rockfinder NorthKaladim 38 3210 1 0 1 CitizenKaladim 108 394 Shopkeeper
210 1 401 -155 3
| Aarina_Ratsbone SouthKaladim 38 3210 0 0 1 CitizenKaladim 108 394 Shopkeeper 5
1 183 -137 3
--------------------------
File to patch:
If I change to where Drawde's files are.

Anyhow here is the Diff file. Now time for some sleep.