If the CD is in hybrid mode, you will be able to read it on a PC.
E.g. the CD from EmulatorArchive is readable on a PC.
But to make the files usable for EMXP, you'll have to add an extension .EII to each of the files, because Mac does not work with extensions (Mac uses resource forks and signatures).
A quick way to do this is to download the trial version of MacDisk for Windows (
www.macdisk.com).
This program can read any Mac CDROM (even non hybrid pure HFS ones).
Define in the signature editor that all signatures which you can see on your CD should receive extension .EII when copying them from CD to your PC harddisk.
E.g. when I load the EmulatorArchive CD in MacDisk, the SDII files seem to have the (basic) signature [filetype = TEXT, creator = ttxt]. So in the signature editor I just added an entry saying that files with these characteristics should receive a PC extension ".EII". Don't forget to save this updated signature configuration before extracting the files from the CDROM !
By the way: on a 100pct Mac disk, the signature of SDII files will be [filetype = EMBK, creator = XFER]. This is the signature required by SoundDesigner for Emulator II.