.odx Files in BizTalk 2009 (VS2008 IDE) Fail to open. "Unspecified Error"

Okay, I'm not sure if this is an SO question, or a ServerFault question, but I figured I'd post here first.

I have a BizTalk project which works like a champ for its original design. It's been deployed and it's working fine. Today, I went in to add some new functionality by modifying one of my orchestrations. When I attempted to open it, I got a message which simply stated: "The operation could not be completed. Unspecified error."

I've closed the IDE and re-opened; I've restarted the machine; I've even allowed Microsoft Updates to run and restart the machine.

Everything else opens just fine (.xsd files, .btms, etc.) so it appears only to be the orchestrations which are failing.

Has anyone ever encountered a similar issue and resolved it (short of reinstalling BizTalk/开发者_开发百科VS, or blowing the orchs away and rebuilding)?

Any help would be appreciated.

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I haven't specifically seen the error you mention, but there are at least two hotfixes for the dev tools and the orchestration designer that you might want to look into... maybe one of them fixes it for you:

• http://support.microsoft.com/kb/977428/en-us
• http://support.microsoft.com/kb/979153