SGP with Windows 7

I have SGP installed on my home PC and on my observatory PC. Both are identical PCs running Windows 7 Home Premium. On my home PC, I can double click on a file name with an .SGF extension and SGP is automatically started and the .SGF file is loaded. On the observatory PC I can double click on a file with the .SGF extension and SGP starts but always opens the default “Test Seq 1” sequence. I have compared the two PCs but can’t spot the difference that is keeping SGP on the observatory PC from opening the SGF file I double click on.

I have even examined the registry entries and did not spot any differences. Any guidance would be greatly appreciated.