.RR File Extension Information

What program uses .RR file extension?

Program : Railroad Tycoon
Program Website: Railroad Tycoon
Company : PopTop Software Inc.
Company Website: PopTop Software Inc.

Extensions starting with

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | #-0-9