launch conditions for mpc-hc (1 Viewer)

[happy]

TV-Server Version:
MediaPortal Version: 1.0.1
MediaPortal Skin: X-Factor
Windows Version: Vista SP1 Ultimate
CPU Type: Intel Celeron 3.3Ghz
HDD: Deskstar 160GB (OS + Databases), 2 X Samsung 1TB Spinpoint Drives (Data)
Memory: 2GB DDR2 667
Motherboard: Foxconn 946 GZ7MA - 8KS2H
Video Card: Asus HD4350 Silent
Video Card Driver: 9.4 Catalyst
Sound Card: Onboard
Sound Card AC3:
Sound Card Driver:
1. TV Card:
1. TV Card Type:
1. TV Card Driver:
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec: SAF
MPEG2 Audio Codec: SAF
h.264 Video Codec: SAF
Satelite/CableTV Provider:
HTPC Case: Antec NSK2480
Cooling: Asaka Heatpipe Cooler, 2x12cm Low Noise Fands
Power Supply: Antec EarthWatts 380
Remote: Generic MCE v2
TV: Asus VH222H
TV - HTPC Connection: HDMI @ 1080p

i been reading about configuring my gfx and mpc to use dxva and using shaders to improve picture quality, and now that i've seen how my hd looks, i want to use mpc to play my mkv's is there a way to set it so that only when mkv's are being played to use external player otherwise use the internal player?? or its either use one or the other