Absolutely, just like Director on a Mac can open a .dir file made on a Windows computer. When you say 'dcr file' I assume it's being hosted in a browser page and viewed via the Shockwave plugin.
I posted the question because of some problem of user to read the web page with dcr.
You assumed right, it is e dcr hosted in a browser page and viewed via shockwave with safari.
I don't know the nature of the problem but the user get an error.
Maybe I must decide to buy a mac and do some test.
Thank you again.