Open up PSPad.ini and under the [Config] section change UserHighLighterName=AutoHotkey, and then add the following to the bottom.
Code:
[AutoHotkey]
Filter=AutoHotkey (*.ahk)|*.ahk
HLTabWidth=0
IndentChar=
UnIndentChar=
Compilator File=C:\Program Files\AutoHotkey\Compiler\Ahk2Exe.exe
Compilator Param=/in |%File%|
Compilator LOG=
Compilator Run=
Compilator Help=C:\Program Files\AutoHotkey\AutoHotkey.chm
Compilator SaveAll=0
Compilator ParsLog=
Compilator Capture=0
Compilator HideOutput=0
Compilator DefaultDir=
Comment=000080001FFFFFFF010
Identifier=1FFFFFFF1FFFFFFF000
Key=1FFFFFFF1FFFFFFF100
Label=000000FF1FFFFFFF000
Number=1FFFFFFF1FFFFFFF000
Preprocessor=008080001FFFFFFF010
Reserved word=000000801FFFFFFF100
Space=008080001FFFFFFF000
String=008000001FFFFFFF000
Symbol=1FFFFFFF1FFFFFFF000
Key Words 2=008000001FFFFFFF100
Key words 3=1FFFFFFF1FFFFFFF100
Prog0=AutoHotkey,|C:\Program Files\AutoHotkey\AutoHotkey.exe| |%File%|§
thanks,
beardboy