.hrc is the file format of Softimage|3D, not XSI. Therefore, you will never be able to export the format unless you write an XSI plugin.
If you need to send data back and forth between SI3D and XSI, then you should get familiar with the dotXSI file format. It's a loose template for shuffling data between applications and platforms.
Matt
Matt Lind
Animator / Technical Director
Softimage certified instructor:
Softimage|3D
Softimage|XSI
speye_21@hotmail.com