Block opening of Text file types

This policy setting controls whether users can open text files in the specified applications. Text files usually have a .txt extension, and Excel users can also open text-based comma-separated values (CSV) and printer files, which usually have .csv and .prn extensions.

If you enable this policy setting, users will not be able to open text files in the specified applications.

If you disable or do not configure this policy setting, users can open text files in the specified applications.

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

excel12.admx

Administrative Templates (Computers)

Administrative Templates (Users)