Global Mapper Pro

Reprojection EPSG 31467 To EPSG 25832 using NTv2 Grid

Dear all,
any ideas how to do this?
I think i need to copy the file BWTA.GSB (which contains the grid of shift Information in binary NTv2-Format) to a certain directory , but how do I make sure that it is used in the transformation process?
Thanks in advance
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