How to slipstream sp3 and post_sp3 updates into office xp professional

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As a conclusion of a deep search in the web and also in this forum it seems that slipstreaming sp3 and post_sp3 updates into office xp install requires to use an office xp cd enterprice edition.

But I have a professional edition! I do not have a "proplus.msi" file in the cd root; i have a "proret.msi" file instead, and the command <<msiexec /p c:\SP3\mainsp3.msp /a c:\Office\proret.msi shortfilenames=true /qb>> does not work.

Has somebody any idea on how to perform slipstreaming in this case?