It sounds like "DPI Virtualization":

https://msdn.microsoft.com/en-us/library/windows/desktop/dn469266%28v=vs.85%29.aspx#dpi_virtualization_and_scaling

Specifically:

The type of scaling that DPI virtualization uses when scaling up in size is based on pixel stretching. While this enables applications to be appropriately sized, blurriness occurs due to the stretched pixels.

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