If you want to use this tag in your game, Steaky has provided the file. I haven't tried it yet, so use it at your own risk. If you run into any problems with the tag, email me. Just put the file in the following directory for each game:

Counter-Strike:

C:\Program Files\Steam\SteamApps\YourEmail@YourISP.com\counter-strike\cstrike\tempdecal.WAD

Day of Defeat (DoD):

C:\Program Files\Steam\SteamApps\YourEmail@YourISP.com\day of defeat\dod\tempdecal.WAD

TFC (Team Fortress Classic):

Death Match Classic:

Half-Life Classic:

Opposing Forces: