Check out this link.
http://www.shipsim.com/ShipSimForum/index.php?PHPSESSID=01c3d2b330dba2c24e9fba8f0ede2dc8&topic=424.0
Nub Cake used the Paint program in Windows XP and a dds converter. She posted a link where to get it.
Use the search function of the forum, you may have to do many different searches, but a great deal of the time you can find someone has already provided info on what you are looking for.
Keep posting on this topic if I can help further.
Gook luck,
WW