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Please notice that the descriptions in this section only apply to the way Visual Basic and Visual Basic for Applications pass string arguments to automation-unaware functions and procedures. Canaima Software provides a utility, the Fortran Interface Description Language Editor (FIDLE) that can create the source code (IDL) of a type library for your Fortran DLLs. When your subroutines are mediated through a compiled type library, Visual Basic passes Bstrings using their native format.