The status of multimedia development for the Wine project is covered in the file "documentation/status/multimedia" in the Wine source tree. Multimedia support still is not completed.
A multimedia section in system.ini could look like this:
Example 8-1. Multimedia Section in System.ini
[mci] cdaudio=mcicda.drv sequencer=mciseq.drv waveaudio=mciwave.drv avivideo=mciavi.drv videodisc=mcipionr.drv vcr=mcivisca.drv MPEGVideo=mciqtz.drv
To override the settings in system.ini the list of loadable (recognized) MCI drivers can be altered in the [option] section of wine.conf, like:
Example 8-2. MCI Driver entry in wine.conf