With Windows 8.1 and Vijeo Designer the Momentary On function cannot be setted as it's explained in the resolution FA296302 for Windows 7.
Windows 8.1 doesn't allow anymore to change the righ click function for both options: touch and pen.

To use Momentary on with Windows 8.1 with Schneider iPC, you have to reinstall the PenMount Windows Universal Driver and apply correct settings during the installation.
Please find all information in the document in attachment.

Released for:Schneider Electric UK