Unless the VB project is password protected you should be able to edit the
code in the VBE just as you would for a normal workbook with code. Then,
when you want to save the changed add-in, click the save button on the VBE
Standard toolbar, making sure the add-in is the active project.

--
Jim
"Joe" wrote in message
...
|I am in over my head here.
| I have a custom "add-in" that is a series of 4 macros that used to work in
| Excel 2003. Now in Excel 2007, one macro is now giving a "Runtime error
| '1004' Autofill method of range class failed" error.
| What can I do to debug this? This add-in is saved as a ".xla" file.
| I have limited experience with macros and wanted to find out if I could
open
| this up to attempt to edit.
| Thanks.