Here is a fix. No I did not come up with it, but It does work on my 3200x1800 13" display.
1. Enable Windows to prioritise external manifests by creating and setting this registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\SideBySide\PreferExternalManifest (DWORD) to 1 as mentioned here (no need to install the mentioned hotfix, just create the registry key) http://support.microsoft.com/kb/91294...
2. Create a Illustrator.exe.manifest file in notepad, paste this text inside, save it, and copy it to the same folder as Illustrator's exe file http://pastebin.com/BZnKwU6a
3. Create a Photoshop.exe.manifest file in notepad, paste this text inside, save it, and copy it to the same folder as Photoshop's exe file, you can use the same file for Dreamweaver, just paste into Dreamweaver.exe.manifest etc... http://pastebin.com/AiZiicT6
4. Run the applications, no need to restart or anything else, and their interface should now have an acceptable size, but a bit blurry as usual with this kind of scaling.
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