The winapp2.ini is the file Preferences then to open the settings window. Locate “download and update cleaners from community (winapp2.ini)” and check it.
You then need to restart the program so that the new definitions are downloaded and added to the program’s cleaning options. Downloading might be the easiest option, but it is not the best if you have modified the winapp2.ini file manually on your system. If you have added your own definitions to it, you might want to import that file instead into Bleachbit to take advantage of those custom locations as well. If that is the case, you need to move the winapp2.ini into the Cleaners directory of the Bleachbit folder to have it recognized by the program after a restart. This works both with the portable version of the program, and the installer.
When the program restarts, you will notice the additional cleaning options listed in the sidebar. Just select the items like you would any other, and click on the preview or clean buttons to process the locations.