The file i18nsearch.uno.dll is a core piece of OpenOffice from Sun Microsystems, Inc. OpenOffice, formally called OpenOffice.org, is an open source software suite that includes business applications that are similar to Microsoft Office. The difference is that OpenOffice is free to all users and continually updated by both a core team and regular users who contribute code to make the programs better.
This file has been part of OpenOffice since before it became an open source project and was called StarOffice. It is still used by the program, and may also be used by other open source programs. You could have it on your computer even if you have never run OpenOffice.
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