It's your personal macro workbook. If you have never recorded a macro then you probably don't have one yet. Excel gives you the opportunity to store macros in a special hidden workbook that will open automatically in the background every time you launch Excel. Any macros stored in this workbook are automatically available for you to use on any other workbook you are working on.
If you hit Tools/ Macro / Record Macro and then use the dropdown arrow to choose 'store in my personal macro workbook', and then type a 1 in any cell and then either hit the stop button or hit Tools / Macro / Stop Recording, you will now have created a personal.xls
You can access this file at any time from the VBE (Visual Basic Editor) by hitting ALT+F11 and looking for the file marked PERSONAL in the tree like view top left on your screen. You can also unhide it using Window / Unhide, but don't forget to hide it again afterwards.
I have hundreds of little routines that make my life a hell of a lot easier, and they are all stored in this workbook. Eveery time I come across a useful routine that someone else posts that may be useful to me, I simply add it to my personal.xls. these routines are then all available via Tools / macro etc, or for the most common ones I use I will assign keyboard shortcuts to them by using Tools / Macro / Macros, clicking on the routine in question, hitting the options button on the dialog box and then putting in the keyboard combo I wish to use to initiate that routine.
Anytime you change your personal.xls and then close Excel you may well be prompted to save changes. If you do not do this then any changes such as keybopard combos etc will be lost.
Regards
Ken...........
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