Using Different User Agents for Websites in SiteKiosk Windows Chrome Browser

For compatibility reasons or identification purposes it can be useful or even necessary to modify the user agent of the browser. You can do that for the browser as a whole in the configuration of SiteKiosk under Start Page & Browser -> Customize.

Replacing the whole default user agent string of SiteKiosk instead of just adding something to it is described here (Chrome) and here (IE).

But a modification that helps on one website can lead to problems on another website. So it can be useful to edit the user agent only for certain pages while on others the default user agent is used. You can do this with SiteKiosk Windows by editing the configuration file of SiteKiosk with an editor like Notepad. Look for urlSpecificUserAgents in the file and create entries for your URL(s). There are two options, you can either just add something to the default user agent of SiteKiosk or you can fully replace the user agent. 

This is how adding something to the default user agent for a specific URL looks like (as you can see, wildcards (*) are supported):

"url": "**",
"userAgent": {
"add": "SiteKiosk Windows"

In this example SiteKiosk Windows is added to the default user agent for the specified page, while other pages receive the default user agent.

You can have as much different specific user agents as you need. This is how more than one looks like:

"urlSpecificUserAgents": [
  "url": "*.google.*",
  "userAgent": {
	"add": "Edg/$(ChromiumVersion)"
  "url": "**",
  "userAgent": {
	"add": "SiteKiosk Windows"

The option to replace the full user agent string with a custom one looks like this:

"url": "**",
"userAgent": {
"full": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36 Edg/89.0.774.76"

This example uses the user agent string of Edge (Chromium engine).

Note that using a user agent that mimmicks another browser can lead to display problems with a webpage. Always test the settings before using them in your production environment.

Changing the User Agent of the SiteKiosk Browser

The user agent string is used to identify the browser with which a client contacts a server. This information can be utilized to decide what kind of content is delivered to the client in return, to make sure the browser receives data that is optimized for exactly that type of browser. 

SiteKiosk uses the public WebBrowser control of the Microsoft Internet Explorer installed on the system. This means that SiteKiosk identifies itself with the same user agent string as the IE. When a standard configuration is used SiteKiosk will add SiteKiosk Version Number at the end of the user agent string, e.g. SiteKiosk 8.6.1251. A full user agent string under SiteKiosk will look like this:

Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; SiteKiosk 8.6 Build 1251)

Adding SiteKiosk to the user agent can be used for example to let a server deliver SiteKiosk Object Model code to a client. You can deactivate this behaviour in the SiteKiosk configuration and you can also add your own identifiers. You can find more information on this topic here:

Ideally the above means that your client browser receives the content it is supposed to display in the most suitable form. If a kiosk project is created from scratch, the content can be optimized to fit the kiosk. Even in projects where content has already been created, it will usually run without modifications on the kiosk, because the content has already been designed for usage in a standard browser like IE.

In some cases though, it might come in handy if your browser could pose as something completely different, for example in a kiosk project where touchscreens should be used. The web pages that should be displayed are already existing in a version for normal browsers and in a version for mobile phones. The mobile phone version would fit perfectly but the server dynamically delivers its content based on the user agent. This means on a normal Windows system you would get the version for standard desktop browsers and not the version for mobile phones. The solution is to completely change the user agent string to one of a mobile phone.

Microsoft already provides this option by means of editing the Windows registry using the registry editor (regedit.exe). Note that changing the registry is always done at your own risk. Making the browser pose as another may also cause script errors or corrupted page layouts. You should carefully experiment with the values described next before applying it to live systems.

The registry key we will have a look at is for the Internet Explorer, but as SiteKiosk is based on the Internet Explorer it also uses it. That means changing the key will change the behaviour for IE and SiteKiosk. A detailed article on the topic of the user agent string on Windows systems can be found here: The registry key can be found at two different locations in the Windows registry.

One location is under

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\User Agent

Note: on a 64-Bit system the location is slightly different

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\User Agent

Editing that key changes the behaviour for all users on the system.

The other location is under

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\User Agent

Editing that key only changes the behaviour for the current user. This means to edit this key you must be logged in with the user you want to change the behaviour for.

On most systems the above key only contains the default value HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\User Agent\Default). For the desired effect we need to add two additional string values (unless they are already there). One is called Platform and the other Version. As an example we will add the following data to Platform (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\User Agent\Platform)

Linux; U; Android 4.0.4;

and the following data to Version (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\User Agent\Version)

AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30

These are values an Android smartphone uses. When the changes are done, we can see the effect by opening the SiteKiosk browser (or IE, as both are using that registry key) and going to With the changes we will be directly transferred to the mobile version of the page. The SiteKiosk user string now looks like this:

Mozilla/5.0 (compatible; AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30; Linux; U; Android 4.0.4;; Trident/5.0; SiteKiosk 8.6 Build 1251)

If the above workaround is suitable for your project and you want to spare yourself the hassle of manually editing the registry on all your kiosk systems, you can use the SiteKiosk ProgramPatcher tool to automatically apply the registry changes.