A question about DFF files

I have some large dff files which are in 5.1 format. I would like to create stereo from these files, preferably with free software. Anyone know whether this is possible?

Marijn said I have some large dff files which are in 5.1 format. I would like to create stereo from these files, preferably with free software. Anyone know whether this is possible?
Jriver can do it on the fly

That works indeed, thank you.

I had become somewhat conspicious about Jriver due to critical posts on an audiophile forum. As far as I can see however the conversion from dff or iso multichannel to dsf stereo seems to work without loss so I am happy with it.