If you already have an existing standard WinPcap wpcap.dll library installed on the machine, then prior to installing, for example, WinDump or Wireshark, you need to prepend the folder SNF_Myri-10G\lib to your PATH in order for Wireshark/WinDump to locate the advanced dll.
[ set PATH=c:\SNF_Myri-10G\lib;%PATH% ]
After the WireShark installation has completed, run wireshark.exe and verify in the Help->About box that it is running the Sniffer-Only wpcap.dll. You should see text such as "based on SNFv3 libpcap". If this text is not present, wireshark may not have located the Sniffer-only wpcap.dll. Please copy the Sniffer wpcap.dll into the C:\opt\wireshark folder and restart wireshark.
Note: WinPcap support is only available in the Sniffer10G v3 software.