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Path: /data/applications/aps/typo3/4.2.1-6/standard/htdocs/typo3/ext/ [ Home ]

File: README.txt

This is only a placeholder. You can use this directory for storing global extensions.
However, try to use locally installed extensions instead (in typo3conf/ext/) in order 
to keep the TYPO3 core directory clean of user defined contents.