With Converter App, you can convert WMV files into many other formats:
WMV to MP4 | WMV to MP3 | WMV to MOV | WMV to WEBM | WMV to AVI | WMV to JPG | WMV to TEXT | WMV to WAV
→ All WMV Converters
If you want to keep working with your final MKV, try:
MKV to MP4 | MKV to MP3 | MKV to SRT | MKV to MOV | MKV to WEBM | MKV to AVI | MKV to WMV | MKV to WAV
→ All MKV Converters