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Question

The file you are trying to open is already in use by another program?

Answer

WindowBlinds started in 1998 when lead developer Neil Banfield teamed up with Stardock. Stardock was looking for a developer to create a window skinning application, and Banfield had already created an app that he called Window Blinds in 1997. Previous attempts by Stardock had included Object Look, a minimal skinning application, and WindowFX, an application written in Delphi. That name would later be reused for WindowFX, also created by Banfield. For a short time there was also a scaled-back version of the original Window Blinds called WBLiteFX, a name which was still present in WindowBlinds registry settings as of May 2006.

— Source: Wikipedia (www.wikipedia.org)