You may try this step by step guide http://www.idealshare.net/video-converter/dvr-converter.html to convert DVR-MS or DVR recordings to other video formats like convert DVR to AVI, convert DVR to MP4, convert DVR to WMV, convert DRR to DivX, Xvid, MPEG, MKV, FLV, VOB, RMVB, WebM, OGV, ASF, MOV, 3GP, DV and other video format.
Convert DVR video to audio format like DVR-MS to MP3, WMA, WAV, AAC, AC3, M4A, AIFF, FLAC, OGG, MP2 and etc audio format.