Need file extension help with recently downloaded PC game
	
	
		I just recently downloaded a PC game, but I have no clue how to combine the split files found in the .tar archive (which can be opened with WinRAR).  I know that it should be .rar files if they were supposed to split files (like something as common as WinRAR), but the extensions just include .001, .002, ~ .054, all in 15 meg chunks, and I don't know what program they've used.  WinRAR normally uses .r00, .r01, etc.  I do have a .sfv file, if that information can help somewhat with my predicament.