problems moving endnote files from PC to MAC

In my research group some people use Endnote on PCs and some on Macs.   There seems to be a problem opening endnote files (.enl) made on a PC in Endnote on the Mac.

Any ideas what can be done?

Many thanks,

They are cross-platform compatible. See http://www.endnote.com/support/faqs/Database/faq1.asp for details.