Please, add per monitor dpi awareness support which was introduced in Windows 8.1 API.
Watch http://channel9.msdn.com/Events/Build/2013/3-017 and read http://blogs.windows.com/windows/b/extremewindows/archive/2013/07/15/windows-8-1-dpi-scaling-enhancements.aspx for reference.
https://trac.videolan.org/vlc/ticket/8957 also can be helpful.
Briefly you need:
1. Declare per monitor DPI awareness in the application manifest
2. Handle Windows Message about that window is moved to monitor with different DPI
3. Update images and window layout