Anna,

YMMV as I am using Office 2003..

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products\9040110900063D11C8EF10054038389C\Usage

WORDFiles

0x2F4600D2 >> Used REG_DWORD
0x2F4600D3 >> Cleared REG_DWORD

This was done on a Trace from RegShot - Registry Tools

HTH,

Kent
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