That's great,
Actually the very first step to start with is to download glovePIE. I downloaded it from here and it works perferct.
http://glovepie.software.informer.com/download/I have also attached it here (.rar format), along with the script I made (included in the .rar file) to play the game. So if you decide to download the attached file you are actually good to go. Otherwise, if you download it from the link, let me know and I will send you my script to have it as a starting point.
The next step is to train your computer to understand your voice. You can do that from the
Control Panel -> Ease of Access -> Speech Recognition -> Train Your Computer (or something like that). First though make sure you have set your microphone up correctly. This training part is quite stupid but for me it DID make a huge difference on my computer's ability to understand my commands (even more because I am not a native English speaker).
The next step is to run glovePIE, load the "DawnOfWar2SpaceMarinesMultiPlayer.pie" file which is placed in the "Voice Scripts" Folder, hit "Run" and then run Dawn of War to start playing.
The good thing is that it is quite easy and straight forward to change the vocal commands that correspond to the letters. So, you can actually check the script, check the commands and keep those you want and delete the rest, which will actually help you computer make less mistakes in the recognition process. For example there is a "Strike" command (for the Merciless Strike) which actually could call command "Time" (for the Veil of Time) if not pronounced well. But if you delete for example "Strike" you will have to call the command "Merciless Strike", which is extremely difficult to be confused with either "Time" or even "Veil of Time" (keep in mind thought, that for me it works absolutely great without having to delete any command from the script). Also, you can alter the commands to be closer to your personal taste. For example you can say "Who's your daddy" and actually call the Orbital Bombardment

.
Let me know if you had any luck or you need any more info/help.
All the best,
Z.