Macro - Color Coding

I am trying to figure out how to run a macro for 1 particular workbook in an excel spreadsheet. I don't want it run on any of the other workbooks in that file, just the 1. I can't use conditional formatting because I need more than 3 values (if statements).

This is what one example of data in a cell and below is the color I'd like it to turn when I run the macro:

T: 6/1/07
A: 6/8/07

Anything that has a A: (which means an actual date it happened) I'd like the cell to turn blue. If there is an RT: (which means revised target) I'd like the cell to turn red which means it missed it's target date, and has been revised. If it has a TBD I'd like the cell to turn pink (or yellow or any color really). All other cells are just white. I don't know where to find the color codes in excel as well. Other samples of what cells look like are below.

Here is another example:

T: TBD

And final example:

T: 6/4/07
RT: 6/15/07