Excluding a Specific Add-In at Startup

Peter asked if there is a way to specify, at Excel startup, that a particular add-in should not be loaded. The add-in he has in mind takes a lot of time to load, and he doesn't need it all the time. Disabling the add-in would help start Excel quicker for those instances when it wasn't needed.

Unfortunately, there is little that can be done to disable add-ins at start-up because no particular workbook is already open. (The add-ins are loaded before any workbooks.) There are a couple of things you could try, however.

The first thing is that you could create your own add-in that does nothing more than ask if the large add-in should be loaded or not. Depending on the user's response, the add-in could then be loaded by using the following line of code:

AddIns("Big Add-in").Installed = True

Of course, you'll need to replace "Big Add-in" with the name of the actual add-in to be loaded. If the user doesn't want the add-in loaded, just skip the line of code. In the Close event for your little add-in you could then add a line like the following that unloads the big add-in:

AddIns("Big Add-in").Installed = False

In this way, the add-in is added only if the user says it is OK to add, and then always unloaded at the end of your Excel session.

Another approach is to never load the large add-in, but put a routine in your Personal.xls file that gives the user a chance to load the add-in. The following could be added to the Workbook_Open event in Personal.xls:

Private Sub Workbook_Open()
    With Application
        .OnKey "{TAB}", "InstallMyAddIn"
        .OnTime (Now + TimeValue("0:00:05")), "DisableTABProc"
    End With
End Sub

The purpose of this macro is to give the user a period of time—in this case five seconds—to press the Tab key so that the large add-in is loaded. The .OnKey method runs the installation routine, if Tab is pressed, and the .OnTime routine starts a timer that runs the disable routine once the five seconds is elapsed. Notice that this macro calls two routines; these can go in a regular module for Personal.xls.

Sub InstallMyAddIn()
    AddIns("Big Add-in").Installed = True
    DisableTABProc
End Sub

Sub DisableTABProc()
    Application.OnKey "{TAB}", ""
End Sub

Of course, you'll need to add some code for the Workbook_Close event of Personal.xls, in this case to unload the add-in:

Private Sub Workbook_Close()
    AddIns("Big Add-in").Installed = False
End Sub

If you prefer to not use macros, then you can always just move the big add-in from it's directory location or rename the add-in prior to starting Excel. If Excel cannot locate the add-in, it continues to load without loading it.