Frank & Pam

Try this amendment

Sub GenRandomNumbers()

Application.Run "ATPVBAEN.XLA!Random", Sheets(2).Range("$a$15"), 1, 99
7, , Sheet(1).Range("MyRange")

End Sub

This assumes that the active workbook will be used.
If you want to reference other than the active workbook you will nee
to further qualify the sheets() reference like thi
workbook.sheets(n).et

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