Help me verify some files
 

I already have the game, Just Cause. But I dont know if the data3.cab and others files are still intact. So how can i know if those files are still 100% ok?

What do you mean by intact?

Do you mean a scratched disk?

if that is what you mean just copy /paste the suspicious files from the cd to your hd and there you realize is the disk is really scratched or not

precicely yesterday i was digging my old WC3 cd and realized the none of my drives wanted to read one of mpq files of the disk

I just cleaned with some solution and I had and the disk worked again

Read entry IV/3. in the forum FAQ about how to check the readability of a CD/DVD.