On vanilla uninstallation, LibreOffice leaves a folder in %PROGRAMFILES%\LibreOffice 3.5\ containing extensions and python folders LibreOffice uninstall should destroy %PROGRAMFILES%\LibreOffice 3.5\ completely.
@Olivier: you did not specify the version. 3.5.4 should remove .pyc files and python folders. I finished a patch today that removes the shared\prereg\bundle directory, too. Please let me know, if your problem is different.
(In reply to comment #1) > @Olivier: you did not specify the version. 3.5.4 should remove .pyc files and > python folders. I finished a patch today that removes the shared\prereg\bundle > directory, too. Please let me know, if your problem is different. @Andras... I actually was uninstalling a 3.5.4 version. Need to double check tomorrow what is left behind.
Andras Timar committed a patch related to this issue. It has been pushed to "libreoffice-3-6": http://cgit.freedesktop.org/libreoffice/core/commit/?id=acdbe9d60e17a128c7c1c5d8994cb04b954cc57e&g=libreoffice-3-6 fdo#51270 fix RemoveExtensions custom action It will be available in LibreOffice 3.6.
Andras Timar committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/core/commit/?id=c66efa24eb4b12beaaabbddc88f7c5aef4faf6c5 fdo#51270 fix RemoveExtensions custom action
Andras Timar committed a patch related to this issue. It has been pushed to "libreoffice-3-5-5": http://cgit.freedesktop.org/libreoffice/core/commit/?id=a13c54699e53e1174d575991ddfb848d6a8a01d9&g=libreoffice-3-5-5 fdo#51270 fix RemoveExtensions custom action It will be available already in LibreOffice 3.5.5.
Andras Timar committed a patch related to this issue. It has been pushed to "libreoffice-3-5": http://cgit.freedesktop.org/libreoffice/core/commit/?id=5cfb974d41642d1acbaadb553c16cf8d174f524a&g=libreoffice-3-5 fdo#51270 fix RemoveExtensions custom action It will be available in LibreOffice 3.5.6.
No new info has come in, and my tests show that this bug is fixed. Help packs were not tested. Once I saw problems with uninstalling help packs. I'll fix it, too, when I find some time.