DWG conversion

Hi to you all
Today I received a bunch of vector files wich should have been in ascii dxf format. But these files are most cleary in a binary format with the extension DWG. Does anybody knows a way to import these files in grass.
Thanks
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* Ronnie Lassche *
* Department of earth sciences *
* Free University *
* Amsterdam *
* lasm@geo.vu.nl *
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