Sitemaps, Meta Data, and robots.txt Forum

I know virtually nothing about robots.txt so forgive me if this question is silly. I figured better safe than sorry. Anyway...

For whatever reason this site has it's directory structure setup like this:

http://www.example.com/product.php/0001
http://www.example.com/product.php/0002
http://www.example.com/product.php/0003
etc.

And:

http://www.example.com/company.php/1234
http://www.example.com/company.php/1235
http://www.example.com/company.php/1236
etc.

They want to block only the /company.php/* ones for fear of overlapping duplicate content (many of the companies only have only 1 product and thus the pages are virtually identical).