Tomba/Tombi

I downloaded the Tomba/Tombi ISO, and I burned it to disc, but I can't get it to play properly on my chipped PS1.
There were 3 files in the folder.
a .ccd, a .img and a .sub
Is there something I have to do to get it to run properly? I'm thinking maybe I haven't burned it right.Could someone please provide me with a step by step tutorial, that has the best program to use?

Keep all those 3 files in the same directory/folder. Now, open your burning program, Image Burn Mode etc. choose the .img file, and then burn at the lowest speed possible. This will make sure that the image is not rushed when being burned to a CD.

Its still not working...
I'm running MagicISO.
It gets as far as the playstation logo screen and then the logo doesn't appear, the lettering does, and two random d's appear as well

Make sure to use good quality CD-Rs, and use the program ImgBurn instead. Try that.

Thanks! Worked a charm