Winapp2.ini additions in CCleaner Discussion Posted January 20, 2015 · Report reply [MS Office 2003*] LangSecRef=3021 Detect=HKCU\Software\Microsoft\Office\11.0 Default=False FileKey1=C:\ProgramData\Microsoft\OFFICE\DATA\OPA11.BAK Is this really safe? Deleting the "OPA11.BAK" file usually de-activates Office (OPA = Office Product Activation). Some FileKeys of your other entries are not correct. Please use the variables only (e.g. %CommonAppData% instead of C:\ProgramData, %ProgramFiles% instead of C:\Program Files). Check the "How to make your own Winapp2.ini entry!" spoiler on page 1 of this thread.