This thread concerns OpenOffice and Inventor. The Word Document posted in this thread explains how to go about editing the Windows Registry.
Never heard of Libre Office before, I have no idea how it interfaces. Best suggestion would be to install OpenOffice, you might be able to use the current version of OpenOffice without having to edit the Windows Registry.
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IV2014 sp1 PDSU / Sim Mech 2014 / Win7-64 EVGA X79 - Classified, iCore7 3930k 32Gb Quad-Channel 950Gb (2 x 500Gb Sata III SSD RAID0 Adaptec 6805E Controller) Nvidia GTX-690 Classified - 331.65 SpacePilot Pro 3.17.1, 6.17.7, 4.11