Block opening of Xll file type

This policy setting controls whether users can open XLL add-in files (*.xll) in Excel 2007.

If you enable this policy setting, users cannot open XLL files in Excel 2007.

If you disable or do not configure this policy setting, users can open XLL files in Excel 2007.

Supported on: At least Windows Vista
Registry HiveHKEY_CURRENT_USER
Registry PathSoftware\Policies\Microsoft\Office\12.0\Excel\Security\FileOpenBlock
Value NameXllFiles
Value TypeREG_DWORD
Enabled Value1
Disabled Value0

excel12.admx

Administrative Templates (Computers)

Administrative Templates (Users)