The extension build in this test uses an update information which is obtained through a http get request. That is the URL does not reference an update information file. Instead it invokes code on a webserver which returns the update information. The URL used in this example is: http://update.services.openoffice.org/ProductUpdateService/check.Update?product=extension&extensionid=org.openoffice.extensions.testarea.desktop.updateinfo&refresh=true The updateinfo.oxt in this directory has the version 1.0 and in the sub-directory "update is the version 2 of this extension. Version 1.0 is also available here /extensions/www/testarea/desktop/updateinfocreation/updateinfo.oxt and version 2.0 here /extensions/www/testarea/desktop/updateinfocreation/update/updateinfo.oxt Therefore they can be accessed through http://extensions.openoffice.org/testarea/desktop/updateinfocreation/updateinfo.oxt and http://extensions.openoffice.org/testarea/desktop/updateinfocreation/update/updateinfo.oxt The latter location (version 2.0) will also be referenced by the update information which are returned by the webserver. The build sub-directory contains the code of the extension (version 2.0) and can be build by calling dmake in this directory. The makefile uses the special macros: EXTUPDATEINFO_NAME=org.openoffice.extensions.testarea.desktop.updateinfo.update.xml EXTUPDATEINFO_SOURCE=description.xml EXTUPDATEINFO_URLS = http://extensions.openoffice.org/testarea/desktop/updateinfocreation/update/updateinfo.oxt This causes the generation of the update information file. This file could be directly references by the URL in the of the description.xml. See also the Wiki entry at: https://wiki.openoffice.org/wiki/Creating_update_information_for_extensions This generated update information file can then be used by the webserver, when it sends back the requested update information. The update information file will be generated in the misc diretory of the output directory. The update information file needs to be copied into common.pro/pus.mxyz directory. The project mwsfinish will process the files in the pus directory.