![]() The project was started by Gianluca Varenni, an Italian software programmer, and is currently being maintained by Riverbed Technology, Inc., an American company that develops WAN optimisation technology. The WinPCap project began in 1999 due to an emergent need to run tcpdump (a common packet analyzer that runs under the command line) on computers based on the Windows platform. WinPcap has found its application in many open source and commercial network tools, including network monitors, network intrusion detection systems, protocol analyzers, traffic generators, sniffers, and network testers. It also includes additional features such as support for remote packet capture, kernel-level packet filtering, and a network statistics engine. WinPCap provides programs the ability to capture and transmit network packets by bypassing the protocol stack. This is a driver file that may be required for the correct functioning of one or several applications and should not be removed. Npf.sys is a filter driver that is essential for the functioning of WinPCap. WinPCap is a packet sniffing tool that provides access to link-layer networks for Windows machines. These files should not be listed in the DefaultUninstall.Services section of the INF file.įor more information about uninstall applications, see Writing a Device Installation Application.The genuine npf.sys file is a software component of WinPCap by Riverbed. Some filter driver files cannot safely be removed when the application is uninstalled.An uninstall application should not delete the INF file (or its associated PNF file) from the Windows INF file directory ( %windir%\INF).For more information about how to list your application in Add or Remove Programs, see "Removing an Application" in the Setup and System Administration section of the Microsoft Windows SDK documentation. Only one item should be listed, representing both the application and the driver. If a user-mode application was installed with the driver, this application should be listed in Add or Remove Programs in Control Panel so that the user can uninstall it if desired.In the DefaultUninstall.Services section of the INF file, the DelService directive should always specify the 0x200 (SPSVCINST_STOPSERVICE) flag to stop the service before it is deleted.To prepare for eventual uninstall, a setup application should copy the driver INF file to an uninstall directory.If you use an application to uninstall your driver, observe the following guidelines: You can also execute the DefaultUninstall and DefaultUninstall.Services sections of your INF file from an uninstall application, as shown in the following code example: InstallHinfSection(NULL,NULL,TEXT("DefaultUninstall 132 path-to-uninstall-dir\infname.inf"),0) Type the following command at the Powershell command prompt: Get-CimInstance Win32_SystemDriver -Filter "name='your_driver_name'" | Invoke-CimMethod -MethodName Delete See Rundll32 and InstallHinfSection for more information. ![]() To execute the DefaultUninstall and DefaultUninstall.Services sections of your INF file on the command line, type the following command at the command prompt, or create and run a batch file that contains this command: RUNDL元2.EXE SETUPAPI.DLL,InstallHinfSection DefaultUninstall 132 path-to-uninstall-dir\infname.inf There is no "right-click uninstall" option. For these OS versions, you can uninstall your filter driver by using the command line, PowerShell, or a batch file to execute these INF file sections, or a user-mode uninstall application. ![]() In Windows 10 prior to version 1903, the DefaultUninstall and DefaultUninstall.Services sections were optional but recommended if the driver could be uninstalled. Starting with Windows 10 version 1903, the DefaultUninstall and DefaultUninstall.Services INF sections are prohibited (with exception). ![]()
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