Hi Bob, in order to playback Matrox Digisuite Legacy files on your Windows XP system you will require the Axio 4.0 software codecs to be installed.
Please download the (Axio_40Update.zip)(125 MB) located here:
http://www.matrox.com/video/en/support/axio/downloads/softwares/release4.0U...
Unzip the file, then open the "VFW Software Codecs" folder and double click on the VFWCodecs.exe to install the codec.
Please let us know if this works out for you...
Best regards,
Bassel