Block opening of files created by pre-release versions of Excel 2007

This policy setting controls whether Excel 2007 users can open Open XML files saved with pre-release versions of Excel 2007. Excel Open XML files usually have the following extensions: .xlsb, .xlsx, .xlsm, .xltx, .xltm, .xlam.

If you enable this policy setting, Excel 2007 users will not be able to open Open XML files created in pre-release versions of Excel 2007.

If you disable or do not configure this policy setting, users can open files that were saved in pre-release versions of the new Office Open XML format.

Supported on: At least Windows Vista
Registry HiveHKEY_CURRENT_USER
Registry PathSoftware\Policies\Microsoft\Office\12.0\Excel\Security\FileOpenBlock
Value NameExcel12BetaFiles
Value TypeREG_DWORD
Enabled Value1
Disabled Value0

excel12.admx

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Administrative Templates (Users)