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Fixing DPI Scaling Issues in Skype for Business on Windows 10

My setup for my day job these days is a Surface Pro 4 and either an LG 34UC87M-B or a Dell P2715Q monitor, depending on where I'm working. This is a fantastic setup, but some applications have trouble dealing with the high pixel density and don't scale appropriately.

One case in point is Skype for Business. For some reason it scales correctly as I move between the Surface screen and the external monitor when I use the Dell, but on the LG monitor Skype is either massive on the external monitor, or tiny on the Surface screen.

After a big of digging around I came across a solution that worked for me, which is to change a setting in Skype's manifest file (who knew there was one?). On my machine the file is here:
C:\Program Files\Microsoft Office\Office16\LYNC.EXE.MANIFEST

And the setting in question is this:

Which I changed to this:

Note that you'll probably have to edit the file as administrator in order to be able to save it.

Once I made that change, saved the file, and restarted Skype, it now scales correctly for both the Surface screen and the external LG monitor.


Matt Woodward said…
Turns out this didn't work after a reboot, even though the settings file stayed the same. It does work fine on the Dell monitor, but isn't happy on the LG for some reason.
Kim Rosgaard said…
Try this in addition to your change in the manifest file:
Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\SideBySide
Make a new DWORD named PreferExternalManifest and set the value to 1
Matt Woodward said…
Thanks for the suggestion! Didn't seem to work on my end but really appreciate the additional information.
Matt Woodward said…
Found something that's working for me at this point -- we'll see if it sticks.

1. Change the LYNC.EXE.MANIFEST file, set to True (I took out the /PM bit)
2. In regedit, find the lync.exe HIGHDPIAWARE key in HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers and delete it.
3. Change the permissions on HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers so your account doesn't have write access. This way the key won't get rewritten.
4. Restart Skype

Found the solution here:
Thanks for the suggestion, Matt. That worked for me!
And... The latest update broke it! :'(
Matt Woodward said…
Argh. Guess I have that to look forward to.
Paul said…
This is crazy, Microsoft handles both of these software packages (Skype for Business and Powerpoint) and they can't fix this issue for multiple versions of the OS and over 4 years of reported issues. I have no other third party software that has scaling issues between monitors of different resolution. Come on Microsoft!!
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Instead of wasting your time why don't you just ask them the Skype support for help here Skype Contact Number
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Dustin said…
The combination of solutions worked for me.
1. Make the change in the Lync manifest as stated above. (Change to False)

2. Make the change to the registry as stated above.
Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\SideBySide
Make a new DWORD named PreferExternalManifest and set the value to 1

Thank you both for these steps. It WORKED!
Thomas Thielen said…
Dustin's comments worked for me. Thank you very much for the solution to this annoying problem.
kratos said…
Thank you.

Applying both the solutions worked.
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Umar Farooq said…

After the basic settings and deploying in IIS getting this error. Any help?

HTTP Error 500.0 - Internal Server Error
scriptProcessor could not be found in application configuration

Most likely causes:
IIS received the request; however, an internal error occurred during the processing of the request. The root cause of this error depends on which module handles the request and what was happening in the worker process when this error occurred.
IIS was not able to access the web.config file for the Web site or application. This can occur if the NTFS permissions are set incorrectly.
IIS was not able to process configuration for the Web site or application.
The authenticated user does not have permission to use this DLL.
The request is mapped to a managed handler but the .NET Extensibility Feature is not installed.

Things you can try:
Ensure that the NTFS permissions for the web.config file are correct and allow access to the Web server's machine account.
Check the event logs to see if any additional information was logged.
Verify the permissions for the DLL.
Install the .NET Extensibility feature if the request is mapped to a managed handler.
Create a tracing rule to track failed requests for this HTTP status code. For more information about creating a tracing rule for failed requests, click here.

Detailed Error Information:
Module FastCgiModule
Notification ExecuteRequestHandler
Handler DictionaryEditor Handler
Error Code 0x80070585
Requested URL http://localhost:8009/
Physical Path C:\a_source\DictionaryEditor\DictionaryEditor
Logon Method Anonymous
Logon User Anonymous

More Information:
This error means that there was a problem while processing the request. The request was received by the Web server, but during processing a fatal error occurred, causing the 500 error.
View more information »

Microsoft Knowledge Base Articles:

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