"TramSim Vienna-SKIDROW" refers to a specific pirated release of the tram simulation game TramSim Vienna by the scene group SKIDROW.
SKIDROW’s release of TramSim Vienna likely targets the game’s SteamStub DRM. The crack works by emulating a legitimate Steam environment, tricking the game into believing a valid license is present. This allows the user to launch and play the game without purchasing it, and often without an internet connection. TramSim Vienna-SKIDROW