MS Office programs keep a list of disabled files that have caused errors when previously opened. A user can remove documents from this list by accessing the list through the
Consolidating previous answers and expounding upon them here.
Office products store disabled items in the registry under keys named HKEY_CURRENT_USER\Software\Microsoft\Office\. For example, Excel 2010's disabled list is under HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Excel\Resiliency\DisabledItems.
Each disabled item is stored as a randomly-named key of type REG_BINARY. The format of the byte array is: