"Can I convert an SMV file to WMV?"

.SMV is a PROPRIETARY video file format of Smith Micro VideoLink (Plus)
about $60, which was typically bundled with OEM hardware:
Camcorders, MP3 devices, ...
So you need Smith Micro VideoLink software to read or write .SMV files.

Besides whichever other video file formats VideoLink supports,
VideoLink can read & write H.323 streams.
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Which means you can use something like VideoLAN
http://www.videolan.org/
to convert another file format via a H.323 connection from/to VideoLink.

.SMV => Smith Micro VideoLink => H.323 stream => VideoLAN => other formats
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If you do not have a Macintosh or Microsoft Windows copy of VideoLink,
you might be able to get one by either purchasing hardware with which it is bundled (some camcorders, & MP3 players, ...) or by contacting:

Smith Micro Software, Inc.
51 Columbia
Aliso Viejo, CA 92656
Voice: 949.362.5800
Fax: 949.362.2300
Sales: 800-964-7674
Sales E-mail: sales@smithmicro.com
OEM Sales E-mail: oemsales@smithmicro.com
General Inquiries: cs@smithmicro.com
http://www.smithmicro.com/default.tpl?group=subcontent&id1=6&id2=217
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References:

http://www.smithmicro.com/press/PCUpgrade100102.pdf

http://www.smithmicro.com/search_results.tpl?keyword=videolink

http://www.fileinfo.net/extension/smv
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For more information or assistance,
contact me LeheckaG on AskVille.