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Stuart[_21_] Stuart[_21_] is offline

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Understanding this code snippett

I have 'found' these lines:

If Len(Dir(Application.Path & "\" & "abc.exe")) = 0 _
Or Len(Dir(Application.Path & "\" & "xyz.dll")) _
= 0 Then
MsgBox " very long message "
Exit Sub
End If
Load UserForm1
UserForm1.Show
End Sub

What exactly is the If statement trying to determine,
please?

Regards.

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