The file you need to input into hdwwiz.exe wizard is called tap0901.inf. Sophos has it under C:\Program Files (x86)\Sophos\Sophos SSL VPN Client\driver. OpenVPN or branded OpenVPN clients, in my case I will use the Sophos SSL VPN client, normally add on the disk during install the Tap driver somewhere. A possible workaround is to add the Tap adapter with hdwwiz.exe(Add Hardware Wizard) and “adjust” it to be recognized by OpenVPN. using OpenVPN GUI/script or by hand with tapinstall.exe or part of a branded OpenVPN client installer and no method will work, on Windows 10 or Windows Server 2016 one potential issue you may encounter is that you cannot add more than one Tap adapter for some reasons ( “tapinstall.exe failed” may be returned if you use tapinstall.exe to add the adapter directly). inf files, if the 'RunOnce' registry key is missing. Windows 2000/XP has a bug that it cannot properly detect new hardware by. You may try to add a new Tap adapter manually, e.g. If your TAP-Win32 driver installation fails with a message such as 'The system cannot find the file specified', its possible that your registry is missing the all-important RunOnce Key. Basically another TAP adapter being needed on the system. You connect to an OpenVPN server and when attempting to connect to a second one, the connection fails with the “ All TAP-Windows adapters on this system are currently in use” message.
Sometimes you may want to have multiple OpenVPN connections from the same Windows desktop connected at a time to different VPN servers. Add Tap adapters with hdwwiz.exe and use them with OpenVPN
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