[p4] Escaping @ in file specification?

[Nathan Fiedler]

I don't know how, but our depot has two files checked in that contain
@ in the name. Now I can't invoke various p4 commands on these files
because Perforce is trying to interpret the string after the @ as a
changelist/client/label/date specification. What can I do to escape
the @ and get p4 working with these files?

Thanks

n

P.S. I've searched the p4 guide, FAQ, and mailing list to no avail.