usage tracking
public static SteamAPICall_t StartPlaytimeTracking(PublishedFileId_t[] pvecPublishedFileID, uint unNumPublishedFileIDs) { InteropHelp.TestIfAvailableClient(); return (SteamAPICall_t)NativeMethods.ISteamUGC_StartPlaytimeTracking(pvecPublishedFileID, unNumPublishedFileIDs); }