A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hi Max Meng.
I've managed to solve the problem!
I had the preview pane open in Windows Explorer, so when I selected the Excel spreadsheet ready to double-click it to open it, the preview window was showing the spreadsheet. It would seem that Windows Explorer probably has to launch the appropriate application (Excel in this case) somehow to show the preview and, in doing so, the PERSONAL.XLSB file was presumably opened in the background..
So...when I double-clicked it to open it, it opened, but because PERSONAL.XLSB was already open (in the Windows Explorer "preview" version), then it didn't open it a second time.
It's one of those problems that, when you find the answer and think it through, then it makes some sort of sense. But trying to figure out why it is happening in the first place is fiendishly difficult!
So, the answer is - don't have the preview pane open in Windows Explorer.
Regards,
Geoff