I have a shared XLSM that is located on a network share. From my Windows 7 system I am able to open the shared workbook in Excel Viewer 2007 SP3 no problem. However, when I try to do it from Windows XP, the Open File dialog box appears instead. Both the Windows XP and Windows 7 machines have Office 2010 installed on them. (I'm needing to give another XP machine that only has Office XP read-only access to the shared workbook but decided to test it out on the machine that already had Office 2010 in case that was what caused the issue.)

Does anyone know what might be causing this bug? Is there a registry tweak that can fix it?