|The standard practice for storing macros that you want to be available when any Excel workbook is open is as follows:|
1 - Create a workbook named personal.xls
2 - Place your macros in this workbook
3 - Hide the workbook
4 - Save it in your xlstart folder
Any workbook stored in xlstart will open whenever Excel opens. Since personal.xls is hidden, it will open hidden so you won't even know it's there - except that you'll be able to access all of the macros stored in it.
You can get to the macros via the VBA editor, via Tools...Macro...Macros or via a button to which you have assigned the macro stored in personal.xls.