2.What does the cleaner delete in the office application?
In Office 2003:
FileKey1=%appdata%\Microsoft\Office\Recent|*.*
RegKey1=HKCU\Software\Microsoft\Office\11.0\Excel\Recent Files
RegKey2=HKCU\Software\Microsoft\Office\11.0\Common\Open Find\Microsoft Office Word\Settings\Save As\File Name MRU
Regkey3=HKCU\Software\Microsoft\Office\11.0\PowerPoint\Recent File List
Regkey4=HKCU\Software\Microsoft\Office\11.0\Publisher\Recent File List
Regkey5=HKCU\Software\Microsoft\Office\11.0\InfoPath\Recent File List
RegKey6=HKCU\Software\Microsoft\Office\11.0\Common\Internet\Server Cache
RegKey7=HKCU\Software\Microsoft\Office\11.0\Common\Internet|UseRWHlinkNavigation
RegKey8=HKCU\Software\Microsoft\MSPaper 11.0\Persist File Name
RegKey9=HKCU\Software\Microsoft\MSPaper 11.0\Recent File List
RegKey10=HKCU\Software\Microsoft\Office\11.0\Word\Data|Settings
RegKey11=HKCU\Software\Microsoft\Office\11.0\Visio\Application|LastFile1
RegKey12=HKCU\Software\Microsoft\Office\11.0\Visio\Application|LastFile2
RegKey13=HKCU\Software\Microsoft\Office\11.0\Visio\Application|LastFile3
RegKey14=HKCU\Software\Microsoft\Office\11.0\Visio\Application|LastFile4
RegKey15=HKCU\Software\Microsoft\Office\11.0\Visio\Application|LastFile5
RegKey16=HKCU\Software\Microsoft\Office\11.0\Visio\Application|LastFile6
RegKey17=HKCU\Software\Microsoft\Office\11.0\Visio\Application|LastFile7
RegKey18=HKCU\Software\Microsoft\Office\11.0\Visio\Application|LastFile8
RegKey19=HKCU\Software\Microsoft\Office\11.0\Outlook\Contact|QuickFindMRU
RegKey20=HKCU\Software\Microsoft\Office\11.0\Outlook\Contact|StripSearchMRU
RegKey21=HKCU\Software\Microsoft\Office\11.0\Outlook\Preferences|LocationMRU
To check other versions, just open the CCleaner winapp.ini file. Do not edit it unless you really know what you are doing.
1.Can anybody add an explanation as to why to uncheck?
The most common complaint is that clearing RegKey10=HKCU\Software\Microsoft\Office\11.0\Word\Data|Settings wipes a bunch of custom settings in Word. If you left everything at default, probably no problem. Also, some people don't like losing the Outlook dropdowns when the last 3 registry keys are wiped.