After various version upgrades and fallback from 3.4.3RC to "LibreOffice 3.4.2 - WIN7 Home Premium (64bit) German UI [OOO340m1 (Build:203)]" File type RTF is no longer associated to LibO.
It might be difficult to reproduce this problem because may be it only appears after excessive version installation as QA testers do.
This bug has been reported using <http://wiki.documentfoundation.org/BugReport_Details>
Might be related to or DUP of "Bug 39963 - Presentation: .ppsx (and others) not associated to LibO"
Is this bug still reproducible with current stable version ? I do not have MS-Windows machine to test myself.
Best regards. JBF
For me still broken with "LibreOffice 18.104.22.168 (RC2) German UI/Locale [Build-ID: 235ab8a-3802056-4a8fed3-2d66ea8-e241b80] on German WIN7 Home Premium (64bit)
Still with 3.5.4
On Win7 and 22.214.171.124, rtf is associated correctly with Writer.