XP's burning utility (IMAPI) actually writes each session as "Track-at-Once" using the highly universal Joliet format.
The only thing stopping another PC from reading it isn't the OS. It's the CD-ROM reader. As long as it's not ancient (more than 7-8 years old), then it should have no problems reading the CD-R or CD-RW that you use in XP.
~cdogg
"Insanity: doing the same thing over and over again and expecting different results." - Albert Einstein
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