How to add new global Gallery themes?

Hi All,

In a base install of LibreOffice (for example), I see a number of clipart Gallery themes and associated files (images, configuration files) at: C:\Program Files (x86)\LibreOffice 4\share\gallery

These appear as default Gallery items for all local users on the computer in question.

What is the correct process to follow to create additional Galleries such that they are also similarly globally available? Creating a new Gallery theme and adding files from within LibreOffice simply creates it in the logged-on user’s profile and only for that user – which is not what I’m after.

I see for each global Gallery in LibreOffice an assocated folder containing image files, and associated .sdg, .sdv, .str, and .thm files are visible in C:\Program Files (x86)\LibreOffice 4\share\gallery. Presumably one follows the same convention for creating additional galleries, but some pointers on exactly how to do this please would be great.