Hi,
Your problem is not due to BSplayer but rather to the fact you don't have the correct video codecs installed.
The error message you get gives you the FourCC code of the required codec. Here's the translation:
DIV3 and DIV4 = movie requieres the DivX ;-) codec 3.11 alpha
DIVX = movie requieres codecs DivX 4.12 or 5.02
MP43 = movie requires microsoft codec MPEG4 version 3
You can get the DivX codecs and some more information
here.
You can download the MP43 codec
here; however
be aware that the use of this codec is illegal since Microsoft prohibited it!.
That doesn't stop anybody from using it of course but I just wanted to point it out so you are warned.
Cheers, Smarties :P