问题
When I add some description to udf in Excel 2003 like:
Application.MacroOptions _
Macro:= "MyMacro", _
Category:= "MyCategory" _
Description:= "MyDesc"
and save the workbook as *.xla to my addin directory, the udf is registering correct when the add in is installed. But if I close the excel and open it again, the udf is still available, but disappears from function wisard.
If I place the registration code above to Workbook_Open excel reports the error: can't modify the hidden workbook.
If I place the registration code to AddInInstall it works only once when addin is installed (or I need uncheck the addin in the addin list and check it again)
How to make udf registered permanently, every time addin is loaded?
来源：https://stackoverflow.com/questions/40948181/registering-udf-in-excel-2003-addin