XCar: Experimental Racing, also named shortly XCar, is a racing videogame developed by Bad Dog with graphics engine XnGine and published by Bethesda Softworks for MS-DOS in 1997. Using the READTM.EXE included utility, you could have read and validate a special file which is saved after every race. READTM could be used to validate games submitted for an on-line racing league or just to "prove" a lap time or finishing status.