Installation and Upgrade > Installing and Configuring PTC FlexPLM > Introduction, Prerequisites, and Conventions > File Structure Changes
  
File Structure Changes
For upgrade installations from releases of PTC FlexPLM before PTC FlexPLM 9.0, the file system structure has the following changes:
The web-root folder has moved from <Windchill> to <Windchill>/codebase, and has been renamed rfa.
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You are not required to change the custom.*.properties files defined in codebase/com/lcs/wc/client/*. They resolve themselves correctly after customizations are in place in the new locations. You must review customizations in depth to ensure compatibility with PTC FlexPLM 9.0 and later releases.
The images folder has moved from <Windchill> to <Windchill>/codebase.
The PTC HTTP Server configuration has changed, and old conf files no longer work. You are not required to make edits, other than the inclusion of the template file.
The Embedded Servlet Engine configuration has been eliminated.
Load files and database setup have changed to use Windchill PDMLink containers and libraries.
The PTC FlexPLM URL has changed from http://<hostname>/LCSW* to http://<hostname>/Windchill/rfa*.
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An asterisk (*) indicates that the context reference might have been changed on site, or that it might change during installation. It is only used here as an example.