What Will Be Installed

Napatech Link-Capture™ Software and WinPcap-NT Installation Guide for Windows

Napatech SmartNIC
Content Type
Software Installation Guide
Capture Software Version
Link™ Capture Software 12.11

Non-system files

The WinPcap-NT installer installs WinPcap-NT non-system files in the %ProgramFiles%\WinPcap or %ProgramFiles(x86)%\WinPcap directory (depending on the WinPcap system version), or in a user defined directory.

Path Description

README.txt, WinPcap-NT uninstaller and links to WinPcap and Napatech websites.

For 32-bit WinPcap-NT: rpcapd.exe.

%ProgramFiles%\WinPcap\docs WinPcap documentation.
%ProgramFiles%\WinPcap\winpcap_4_1_3 WinPcap-NT source code.
%ProgramFiles%\WinPcap\winpcap_4_1_3_dev WinPcap Developer’s Pack.

The WinPcap-NT configuration file: ntpcap.ini. See The ntpcap.ini File.

System files

The WinPcap-NT installer installs these system files:

Path Files
%SystemRoot%\Windows\System32\ WinPcap-NT 64-bit DLLs: Packet.dll, wpcap.dll, pthreadVC.dll
%SystemRoot%\Windows\SysWOW64\ WinPcap-NT 32-bit DLLs on 64-bit Windows: Packet.dll, wpcap.dll, pthreadVC.dll
%SystemRoot%\Windows\System32\drivers\ npf.sys


By default the WinPcap-NT shortcuts are installed into the Windows Start Menu under All Programs > WinPcap.

Registry entries

The WinPcap-NT installer registers npf.sys (and rpcapd.exe for 32-bit WinPcap-NT) as a Windows service, creating entries under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services.

Environment variables

These Windows environment variables are set as the result of the WinPcap-NT installation:

Variable Example Description
PCAP_API C:\Program Files\WinPcap\winpcap_4_1_3_dev\include WinPcap Dev. Pack headers, if installed
NAPATECH3_ROOT C:\Program Files\Napatech3 Napatech Windows driver software root