Application.GetOpenFilename

Dim vReturn As Variant 
vReturn = Application.GetOpenFilename() 
If TypeName(vReturn) = "Boolean" Then 
   'therefore False must have been returned
End If 

This method can return either False, a single filename or an array of filenames if multi-select=true

However the following lines of code will only work when Windows Language is English

Dim sReturn As String 
sReturn = Application.GetOpenFilename() 
If sReturn = "False" Then 
End If 

This method automatically converts the returned value to a string using the Windows Regional Language
Use the Object Browser and check the type returned from the function or method.

For example Application.GetOpenFileName returns a Variant which can contain True or False
If you assign the returned value to a string data type the Boolean value is converted using WRS and will therefore not always equal "False"