Hi Jean,
my current development PC has exact the same configuration x64 / WINDOWS 10 with office 365 (2016).
I think the Windows 10 anniversary update has been automatically installed by Windows update within the last days on your PC.
On my PC this destroyed the functionality of many programs. After 1 day and several other automatic windows 10 updates the problem vanished without any action from my side.
I would suggest to force the PC for additional Windows updates and install them if available. After this thry WDRegisternet.exe again. If this does not help please reinstall Win-Digipet. The comDlg32.ocx is no special Win-Digipet component, it is used by many, many programs.
Regards
Markus