mkv in quick view panel

[fenixproductions]

2lolller

If you have proper codecs installed in your system it should be simple:
1. Open your mmedia.ini file and add MKV to MMEXT property.

MMEXT = mkv,mpe,mpg,m1v,mpeg,asf,asx,wma,wmv,avi,aiff,wav,au,snd,aifc,rmi,midi,mid,cda,wvx,wax,vob,ifo,dat

2. Change the order of lister plugins in wincmd.ini to have mmedia first.

[ListerPlugins]
0=%COMMANDER_PATH%\PLUGINS\wlx\Mmedia\mmedia.wlx
0_detect=MULTIMEDIA
1=%COMMANDER_PATH%\PLUGINS\wlx\VisualDirSize\visualdirsize.wlx
1_detect=EXT=""
2=%COMMANDER_PATH%\PLUGINS\wlx\Fileinfo\fileinfo.wlx
3=%COMMANDER_PATH%\PLUGINS\wlx\ArchView\ArchView.wlx
4=%COMMANDER_PATH%\PLUGINS\wlx\ICLView\ICLView.wlx
4_detect=MULTIMEDIA & ext="ICL" | ext="ICO" | force
5=%COMMANDER_PATH%\PLUGINS\wlx\IEView\ieview.wlx
6=%COMMANDER_PATH%\PLUGINS\wlx\xBaseView\xBaseView.wlx
6_detect=EXT="DBF"|EXT="DBC"|EXT="DB"|EXT="MDB"|EXT="MYD"|EXT="GDB"|EXT="FDB"|EXT="MDF"|EXT="XLS"|EXT="CSV"|EXT="TAB"|EXT="HTM"|EXT="HTML"|EXT="XML"|EXT="CDS"|EXT="BDE"|EXT="UDL"|EXT="DSN"
7=%COMMANDER_PATH%\PLUGINS\wlx\Imagine\Imagine.wlx
7_detect=MULTIMEDIA
8=%COMMANDER_PATH%\PLUGINS\wlx\OfficeView\office.wlx
9=%COMMANDER_PATH%\PLUGINS\wlx\PDFFilter\filter.wlx
10=%COMMANDER_PATH%\PLUGINS\wlx\TorrentLister\TorrentLister.wlx
10_detect=EXT="TORRENT"
11=%COMMANDER_PATH%\PLUGINS\wlx\TrueTypFont\TTFViewer.wlx
11_detect=FORCE | EXT="TTF" | EXT="OTF"
12=%COMMANDER_PATH%\PLUGINS\wlx\Smi\smi.wlx
12_detect=ext="SMI" | force
13=%COMMANDER_PATH%\PLUGINS\wlx\3DFileViewer\WCPFREP.wlx
14=%COMMANDER_PATH%\PLUGINS\wlx\MDLviewer\mdlviewer.wlx
14_detect=EXT="MDL" & [0]="I" & [1]="D" & [2]="S" & [3]="T"
15=%COMMANDER_PATH%\PLUGINS\wlx\Wise Tracker\wt.wlx
15_detect=FORCE | EXT="MOD" | EXT="NST" | EXT="STM" | EXT="STZ" | EXT="S3M" | EXT="S3Z" | EXT="IT" | EXT="XM" | EXT="XMZ" | EXT="MTM" | EXT="ULT" | EXT="669" | EXT="FAR" | EXT="AMF" | EXT="OKT" | EXT="PTM" | EXT="MO3"
16=%COMMANDER_PATH%\PLUGINS\wlx\Md2\md2wlx.wlx
16_detect=FORCE | EXT="MD2" & [0]="I" & [1]="D" & [2]="P" & [3]="2"
17=%COMMANDER_PATH%\PLUGINS\wlx\Nfoviewer\nfoviewer.wlx
17_detect=ext="NFO"
18=%COMMANDER_PATH%\PLUGINS\wlx\DVI\dvi.wlx
18_detect=EXT="DVI"
19=%COMMANDER_PATH%\PLUGINS\wlx\GSALister\GSALister.wlx
19_detect=([0]!="M" | [1]!="Z")

The other way is to try to use mplayer4tc plugin but I can't guarantee success (it stopped working for me some time ago).