AER, have a look at the script I've posted here,
http://qa.sqlservercentral.com/scripts/contributions/569.asp
It does a find and replace within ActiveXScripts. Probably be able to modify it a bit to search other properties or collections in the package.
Hope this helps
Phill Carter
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Colt 45 - the original point and click interface
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Colt 45 - the original point and click interface