This download (VSTOR30.exe) installs the Visual Studio Tools for the Office system 3.0 Runtime, which is required to run VSTO solutions for the 2007 Microsoft Office system built using Microsoft Visual Studio 2008.
When installing the VSTO runtime on a non-English version of the operating system, you should also install the appropriate language pack to see the text of the messages from the VSTO runtime in that language, rather than English.
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