This file is used by WinPcap, a packet capture program. You can read more about what this file does in the WinPcap User's Manual.
wpcap.dll Review – How to Fix wpcap.dll Error
Follow these steps in the order they are listed below to try the simpler solutions first.
Recover the file from the Recycle Bin. The simplest possible cause of a "missing" wpcap.dll file is that you accidentally deleted it.
If you suspect this, but you've already emptied the Recycle Bin, you may be able to recover the file using a free data recovery program. Just make sure the file was working properly when you did that (that is, it wasn't corrupt or malicious).
