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copied!<p>See this related Stack Overflow <a href="https://stackoverflow.com/questions/131666/vista-and-programdata">question</a>, in particular from the <a href="http://blogs.msdn.com/cjacks/archive/2008/02/05/where-should-i-write-program-data-instead-of-program-files.aspx" rel="nofollow noreferrer">link</a> from this <a href="https://stackoverflow.com/questions/131666/vista-and-programdata/313120#313120">answer</a>:</p> <blockquote> <p><strong>FOLDERID_ProgramData / System.Environment.SpecialFolder.CommonApplicationData</strong></p> <p>The user would never want to browse here in Explorer, and settings changed here should affect every user on the machine. The default location is %systemdrive%\ProgramData, which is a hidden folder, on an installation of Windows Vista. <em>You'll want to create your directory and set the ACLs you need at install time.</em></p> </blockquote> <p>So if you intend your users to be able to write to this folder you'll have to give them appropriate access when your installer runs.</p> <p>If they have write access to the folder then I don't think you'll run into problems with the virutalisation. However, you should really mark your application with the privilege level it requires by adding something like this to your manifest (<a href="http://channel9.msdn.com/posts/jmazner/How-To-Tell-Vistas-UAC-What-Privelege-Level-Your-App-Requires/" rel="nofollow noreferrer">details</a>):</p> <pre><code><security> <requestedPrivileges> <requestedExecutionLevel level="asInvoker" /> </requestedPrivileges> </security> </code></pre> <p>This will disable virtualisation for your process. You can see whether your process is being virtualised by adding the "Virtualization" column to Task Manager under View - Select Columns...</p> <p>Incidentally, Directory.CreateDirectory() will create parent directories automatically.</p>

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