What it should do, play movies using mci? I made a multimedia player some years ago with fasm, I attach two version, the extended one is MP3WF01 and works ok with it, the MP3WF03 is a tiny version, when you open the file with it you can view it with the previous player, but when you click on accept cannot play it, I have to check it.
EDITED: The problem is the window size that doesn't allow to view the buttons to play it, if you put
cdXSize equ 640
cdYSize equ 440
for example, it wuould be nice