AcroOpenEx
Overview
AcroOpenEx is an Adobe Acrobat plugin to open/reopen PDF files without locking them.
Requirements
Acrobat Professional/Standard (Version 7 or 8)
Acrobat Reader is NOT supported 
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Installation
Copy AcroOpenEx.api to the Acrobat plugin directory (e.g., C:\Program Files\Adobe\Acrobat X.X\Acrobat\plug_ins).
TeXnicCenter Configuration
Goto Build→Define Output Profiles… and click Viewer:
To update Acrobat in the background without switching input focus to Acrobat replace ”%bm.pdf”,1 by ”%bm.pdf”,0.
License
This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.