[Solved] ISO has no file extension?

So I downloaded the Razor release of The Sims 3, extracted the rar’s and joined the files with HJ Split, but the file that comes out is blank, its just a FILE. I’ve downloaded it twice now and its just not coming up!
PLEASE HALP! D:
Answer #1
Under folder options go to view and untick hide extensions for known file types , failing that make sure its not ascociated with winrar, if thats a fail , try simply renaming it.
Answer #2
Your problem is you used HJSplit…Those .001 and so on are Winrar files…If you still have the files…Open Winrar (Don’t right click)…Highlight the .001 part and hit the Extract button at the top…
Answer #3
Thanks so much guys! <3