Copy2dvd multipart iso?

i wanted an iso master, copy2dvd set to ios creation mode, the version ive got seems to make one 1 gig iso file and four smaller files (xxx.i01,xxx.i02 etc…), this seemed logical ro me as i thought it was just a multipart iso, but I cant get at anything in any of the files other than the iso file? should copy2dvd be able to extract these files, or do i need other software?
thanks in advance

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