How do i open a mobile .pxl extension on my desktop with office 20
 

I recently purchased a new PC with Vista and Office 2007. I have an older
IPAC that required me to download windows mobile to be compatible. Everything
seems to work and Sync ok except my Excel files now have a .pxl extension
that I have been unable to open on my desktop. I tried associating one with
excel but it did not translate correctly.