LOdev 3.6 uses the same "user"-folder than LOdev 3.5. But when LOdev 3.6 is installed, the existing file registrymodifications.xcu is deleted and replaced with a new, nearly empty file.
I see this on German WinXP.
Could you please retest that...
Cannot reproduce: starting from a non-existing %APPDATA%\LibreOffice, installed LibO_3.5.6_Win_x86_install_multi.msi, started soffice, set "Tools - Options... - LibreOffice - User Data - Address - Company" to "foo", quit soffice, installed LibO_18.104.22.168_Win_x86_install_multi.msi, started soffice, checked that "foo" setting is still there, quit soffice, checked that "foo" setting is still in %APPDATA%\LibreOffice\3\user\registrymodifications.xcu.
Dear Bug Submitter,
This bug has been in NEEDINFO status with no change for at least 6 months. Please provide the requested information as soon as possible and mark the bug as UNCONFIRMED. Due to regular bug tracker maintenance, if the bug is still in NEEDINFO status with no change in 30 days the QA team will close the bug as INVALID due to lack of needed information.
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See comment #2