This was posted by Rob Bovey:

Application.Run "'YourAdd-in.xla'!YourSubName", Arg1, Arg2, ....

Just for completeness, if the routine is a function and you want to capture
the return value, you write it as

x = Application.Run("'YourAdd-in.xla'!YourSubName", Arg1, Arg2)

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Another alternative would be to add a reference to your workbook that points at
your addin.

Give your addin a nice unique project name (not VBAProject) and then with your
other workbook's project active:

Tools|references|
click on that addin's project.

Then you can use your functions/subs in the addin just like they were part of
that same project.

gm139 wrote:

Does anybody know the syntax to execute
a function stored in a .XLA file.

I have tried with

[projectname].[module].functionname

but i get an error.

Thanks

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gm139
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Dave Peterson