CorelDRAW will accept PDF or CGM files, which are both NX supported formats.
To verify this, I just downloaded an evaluation copy of CorelDRAW X4 and I was able to open both PDF and CGM files which I had created using NX. As for supporting .plt files, once a file is opened in CorelDRAW, there should be no concern as to what the original format of the file was, correct?
John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Cypress, CA