How To Open A .cap File



Right-click on the CAP file and go through 'Open with' 'Choose default program'. In the pop-up windows, choose a program as the CAP file opener. If you decide to always open CAP files with the program, only check the option ' Always use the selected program to open this kind of file '. B) Select another application to open CAP files on Mac. Converting.etl to.cap: In order to open the capture in WireShark we start by opening the capture in Microsoft Message Analyzer: Once the file has been fully loaded you go to File then Save As: From the Save As window click on Export: Next we want to specify the file name, make sure that you select.cap.

In my previous post regarding useful commands I showed how to perform a packet capture between a client machine and a remote machine using IP filters. When the capture is complete you will end up with a .etl file which requires Microsoft Message Analyzer.

Collecting a capture:

As a refresher the process to perform a netsh packet capture is as follows:

  1. To start your packet capture you need to first issue the following command:


2. After the trace has started reproduce the behavior you are looking to capture. In our example we will be using psping to generate traffic between IPs 192.168.1.55 & 192.168.1.5.
3. Now that we have reproduced the behavior you must stop the netsh trace, this process takes time and is initialized using the following command:

Analyzing the capture:

My personal preference is to use WireShark to process the results of netsh packet captures. Unfortunately WireShark cannot directly open .etl files so you must first open the file with Microsoft Message Analyzer and then export the results to a .cap file which WireShark can process. One thing to keep in mind is that the larger the capture the more resources that Microsoft Message Analyzer which can put a big strain on your system

Converting .etl to .cap:

In order to open the capture in WireShark we start by opening the capture in Microsoft Message Analyzer:
Once the file has been fully loaded you go to File then Save As:
From the Save As window click on Export:
Next we want to specify the file name, make sure that you select .cap:
When the export is performed you will get a message indicating that some of the messages where incompatible and were not exported:
At this point the .etl file we started with has been converted to a .cap file which can now be opened in WireShark.

How To Open A .cap File

Viewing the .cap with WireShark:

Now that we have a .cap file you can open this using WireShark. Once the file has been opened you will be greeted with a screen similar to the following:
First thing you will notice is this doesn't look like a normal packet capture. The reason for this is there are additional NetMon_Events that can be filtered out to get the data we are really after. To do this add the following filter to WireShark:

How To Open A .cap File

This will give us much cleaner trace to then read through:
I'm not going to go into WireShark filters at this time although I might in the future. For now if you need additional details on the different filters available take a look at https://wiki.wireshark.org/CaptureFilters.

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If You Don't Have NetMon Capture File, Snoop Capture File, or Telix Session Capture Software Installed

In order to open your CAP file, you will have to download NetMon Capture File, Snoop Capture File, Telix Session Capture, or another similar software package.

If Your Computer is Not Configured to Open CAP Files

If you have the relevant software, but your computer still won't open the software, you will have to change the file associations on Windows or Mac. Depending on your operating system, you can ensure that your computer always open CAP files using NetMon Capture File, Snoop Capture File, Telix Session Capture, or another program of your choice that uses CAP files.

Cap File Extension

If that still doesn't work, you can get in touch with your software developer to find out what you can do. You can contact any of these developers for more information or assistance:

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If the CAP File is Corrupt

In some instances, you may receive an error message stating that the file is corrupt. If you have tried all of the above, and it still doesn't work, download or request a new copy to see if that works.

How To Open A Cap File

Open CAP File the Easy Way

If you don't want to download NetMon Capture File, Snoop Capture File, or Telix Session Capture (for whatever reason), and the other options also don't work.. that's okay!

Even though some CAP files must be opened in a program for which it was developed (binary format), you may still be able to open it in a universal file viewer such as File Magic. Download File Magic now from the Microsoft Store and open your CAP file!

What Is A Cap File

Recommended Download

How To Open A Cap File Mac


How To Open A .cap File

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