hkey_current_user\software\microsoft\windows nt\currentversion\extensions
    xla = [DELETE]
    xlc = [DELETE]
    xll = [DELETE]
    xlm = [DELETE]
    xls = [DELETE]
    xlt = [DELETE]
    xlw = [DELETE]
    qry = [DELETE]
    ppt = [DELETE]
    gra = [DELETE]
    doc = [DELETE]
    dot = [DELETE]
    rtf = [DELETE]
    MDB = [DELETE]
    MDA = [DELETE]
    MVB = [DELETE]
    

hkey_current_user\software\microsoft\windows nt\currentversion\extensions
    xla = #OFC43INST#\EXCEL\excel.exe ^.xla
    xlc = #OFC43INST#\EXCEL\excel.exe ^.xlc
    xll = #OFC43INST#\EXCEL\excel.exe ^.xll
    xlm = #OFC43INST#\EXCEL\excel.exe ^.xlm
    xls = #OFC43INST#\EXCEL\excel.exe ^.xls
    xlt = #OFC43INST#\EXCEL\excel.exe ^.xlt
    xlw = #OFC43INST#\EXCEL\excel.exe ^.xlw
    qry = #SYSTEMROOT#\MSAPPS\MSQUERY\msquery.exe ^.qry
    ppt = #OFC43INST#\POWERPNT\POWERPNT.EXE ^.ppt
    gra = #SYSTEMROOT#\MSAPPS\MSGRAPH5\GRAPH5.EXE ^.gra
    doc = #OFC43INST#\WINWORD\WINWORD.EXE ^.doc
    dot = #OFC43INST#\WINWORD\WINWORD.EXE ^.dot
    rtf = #OFC43INST#\WINWORD\WINWORD.EXE ^.rtf
    MDB = #OFC43INST#\ACCESS\MSACCESS.EXE ^.MDB
    MDA = #OFC43INST#\ACCESS\MSACCESS.EXE ^.MDA
    MVB = MVIEWER2.EXE ^.mvb