The mdpistol.zip file you have requested: Mods / Multi Player / Dual Pistol - 156.33kb is not available. Perhaps try browsing all files for the game Aliens vs. Predator 2 and upload any files you want to share or are missing. This is the only information we could locate:
Here is a little mod which will let you use the powerful M-4A4 pistol from Primal Hunt in AvP2 MP. It was available to the Corporates in that game, giving them the ability to use two pistols at the same time.