Lync 2010 Group Chat client won't open certain file types - is this hackable?

I have finally come to the end of  lengthy task getting Lync Group Chat working. It works great, and for our purposes is what we need.

However, one of the things we want to do is to be able to easily exchange .dss dictation files amongst staff. I don't want them to have to save them locally first, but instead just open them up straight from the Group Chat client app in to the Philips DSS player.

It won't allow us to do this, because of some kind of security setting. It insists on saving first, then (having done this) on trying to open the file from the 'open' link, we get the message:

"For security reasons, this type of file can't be opened using Microsoft Lync 2010 Group Chat. The file folder will be opened instead."

I would have thought that somewhere a registry setting for either the client or the Group Chat server (or both) sets what file extensions are allowable for straight opening, and which are not. Does anyone have an idea of how I might be able to make .dss files trusted, so they can easily be exchanged? Otherwise, I'm going to have to set out dictation recorders to MP3 format recording (as this doesn't suffer the same problem), which seems a shame.

Many thanks,

Bobby
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bluemercuryAsked:
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bluemercuryAuthor Commented:
OK - no one seems to know how to do this. I suspect it isn't possible - all registry associations indicate that DSS files should open fine from a Group Chat window.

Our recorders only encode in MP3, so I had no choice but to use a simple right click converter app on dictation user systems to do a quick conversion to MP3. Then the file can be dragged and dropped on to Group Chat, and opened directly from the same client app by other users.

It's not the cleanest solution, but it does the job. Our transcription software is free, but only can play-back MP3 files (not DSS) so the bonus of doing it this way is we do end up with a cheaper solution, if not the purist one.
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