Our users are starting to get the message "Your current version of Design Review does not support files of this type."

The file was created while DR 2009 was install (Jan 2009) and worked fine with both DR 2009 and 2010. Over the last week the files are coming up with the error message. I've restored from previous dates without success.

Anybody have thoughts on what might have changed to cause this to happen.

Thanks,
Steve