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VOLT includes various supplemental files including a version of USP10.dll (AKA as Uniscribe) users can optionally use that .dll for font testing fonts (for example by copying it into a folder along with a copy of notepad.exe).
Based on today's security advisory we would recommend avoiding using using that DLL. For more details see http://www.microsoft.com/technet/security/bulletin/MS10-063.mspx
In the coming days we'll replace the current VOLT download with one that does not include Uniscribe.