Since installing WinFX 3.0 beta upon release, I've found that I can no longer open MS Office Excel Workbook files directly by clicking on the saved file itself. If I create and save a file in MS Office Excel format, then subsequently click on that file to open it, only the Excel application window opens - not the file itself. The file must be clicked a second time or opened from the file menu within the Excel program before it will appear in the application window. I did not experience this problem with any previous versions of WindowFX (including betas). Uninstalling WinFX entirely (through SDC) solves the problem, whereas reinstalling brings the problem back. Interestingly, this issue does not seem to affect MS Office Excel files that are saved in XML spreadsheet format, only those saved as Workbook files. For what it's worth, WindowBlinds is not currently installed on my machine.
Specs:
Dell Dimension 8400 Pentium 4 3.2GHz w/ HT
Windows XP Media Center 2005 w/ SP2
Nvidia GeForce 6800 256Mb, driver version 6.14.10.8198(81.98)