Can I customize the Magento app/code/core folder without affecting future upgrades?

Posted by mck89 on Stack Overflow See other posts from Stack Overflow or by mck89
Published on 2010-02-18T08:33:44Z Indexed on 2010/06/11 3:13 UTC
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php

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magento

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upgrade

I found a guide on how to add new attributes to users, it explains that for this operation I must modify some files in the app / code / core / Mage directory (the directory that contains Magento’s modules).

But if i make some changes in that folder will this affect future upgrades?

Will an upgrade will delete my changes?

Should I limit the changes only to my modules to not have problems with updates?

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