The uspmatchskin.zip file you have requested: Skins / Weapons / Half Life 2: Grey and Orange USP Match Skin - 270.08kb is not available. Perhaps try browsing all files for the game Half-Life 2 and upload any files you want to share or are missing. This is the only information we could locate:
Here's a simple reskin for the USP that changes it to dark grey, and orange. Not much can be said about it, since it's basically just a different colored USP. The body has been darkened to a dark grey, while orange has been added at the "sights" of the pistol.