The new version 8.0.0.430 can hide the file menu items for the ms office 2013 with the following settings.

function OA1_BeforeDocumentOpened()
{
document.OA1.DisableFileCommand(1, true);//wdUIDisalbeOfficeButton
document.OA1.DisableFileCommand(2, true);//wdUIDisalbeNew
document.OA1.DisableFileCommand(4, true);//wdUIDisalbeOpen
}

More options:

wdUIDisableOfficeButton   =    0×00000001,
wdUIDisableNew   =    0×00000002,
wdUIDisableOpen    =    0×00000004,
wdUIDisableUpgradeDocument     =    0×00000008,
wdUIDisableSave   =    0×00000010,
wdUIDisableSaveAs  =    0×00000020,
wdUIDisableSendAsAttachment   =    0×00000040,
wdUIDisableClose   =    0×00000100,
wdUIDisablePrint   =    0×00000200,
wdUIDisablePrintQuick   =    0×00000400,
wdUIDisablePrintPreview   =    0×00000800,
wdUIDisableSaveAsMenu   =    0×00001000,
wdUIDisablePrepareMenu   =    0×00002000,
wdUIDisablePermissionRestrictMenu   =    0×00004000,
wdUIDisableSendMenu    =    0×00008000,
wdUIDisablePublishMenu    =    0×00010000,
wdUIDisableServerTasksMenu   =    0×00020000,
wdUIDisableCopyButton   =    0×00040000,
wdUIDisableCutButton   =    0×00080000,