On the official website of the product, the software is listed as being able to convert MRS-8 V-takes into WAV/AIFF files, but it's not specified how to do it. I have also checked the manual, but couldn't find anything for this procedure. To obtain additional information, contact your local distributor. He might be able to offer assistance for this issue.
Locate the distributor using the table on the following page: http://www.zoom.co.jp/contact/