= Installing an uninstalling the TAP-drivers =

Occasionally you may have to try out different versions of the Windows TAP-driver. This can be done with ''<openvpn-install-dir\bin\tapinstall.exe''. This tool is actually renamed [http://support.microsoft.com/kb/311272 Devcon.exe].

It's fairly straighforward to use ''tapinstall.exe'' from a command-prompt. The <id> is an identifier which ''tapinstall.exe'' uses to detect the correct driver. In case of OpenVPN 2.2* it's ''tap0901''. This may be different in older/newer versions. To view information about an installer driver use

{{{
$ tapinstall.exe hwids <id>
}}}

To uninstall a driver use:

{{{
$ tapinstall.exe remove tap0901
}}}

To install a new TAP-driver use

{{{
$ tapinstall.exe install <something.inf> <id>
}}}

It's also possible to [wiki:BuildingOnWindows#ExtractingsignedTAP-driversfromanOpenVPNinstaller extract TAP-drivers from OpenVPN installer] without installing OpenVPN.

= Extracting TAP-drivers from OpenVPN installers =

If you need to run OpenVPN on Windows Vista/7 64-bit you have to use signed TAP drivers. Unless you sign them yourself, you need to do two extra steps:

 * Extract the TAP-drivers (*.cat, *.sys, *.inf) and ''tapinstall.exe'' from an official OpenVPN installer using [http://www.7-zip.org/ 7-zip]. The 64-bit versions are larger in size.
 * Place 32-bit signed TAP drivers and corresponding ''tapinstall.exe'' to ''<openvpn-build-root>\tap-prebuilt\i386''
 * Place 64-bit versions to ''<openvpn-build-root>\tap-prebuilt\amd64''