For my car MP3 project, I have gotten my Crystalfontz serial LCD to work with Mpxplay via a program called MPXF. It includes a TSR that grabs info from the Mpxplay screen and pushes it to the LCD.
The current version of Mpxplay is 1.47.4, and the most current version of MPXF is 1.4. All development of MPXF was stopped in 2000, but some enthusiasts got ahold of the source code and made some updates that allow MPXF to work with Mpxplay version 1.43 and up. It's unofficially called MPXF version 1.44.
I found the programs at the following locations:
Mpxplay 1.47.4 (DOS 7.x/Win9x version)
http://mpxplay.tripod.com/Mpxp_4gw.zip
Mpxplay 1.47.4 (DOS 6.x ONLY version)
http://mpxplay.tripod.com/Mpxplay.zip
As for MPXF 1.44 unofficial, I will have to email you the program. I looked for hours online, and I was VERY lucky to find it. What is your email address?
-trophoblast