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copied!<p>I am assuming you're using the VS2008 built-in installer and not InstallShield or Wise or something like that (which both have much better ways).</p> <p>You can create an installer class that adds it (see below).</p> <p>You then add your installer class as a <a href="http://msdn.microsoft.com/en-us/library/d9k65z2d(VS.80).aspx" rel="nofollow noreferrer">custom action for install and uninstall</a> and add <a href="http://msdn.microsoft.com/en-us/library/9cdb5eda(VS.71).aspx" rel="nofollow noreferrer">custom actions data</a> with the path you want, for example to add the TARGETDIR to the Path ...</p> <blockquote> <p>/VariableName="Path" /Value="[TARGETDIR]\"</p> </blockquote> <pre><code>using System; using System.ComponentModel; namespace Emv { [RunInstaller(true)] public class Installer : System.Configuration.Install.Installer { public Installer() { } public override void Install(System.Collections.IDictionary stateSaver) { base.Install(stateSaver); try { var varName = this.Context.Parameters["VariableName"]; var valToAdd = this.Context.Parameters["Value"]; var newVal = String.Empty; var curVal = Environment.GetEnvironmentVariable(varName); if (curVal != null && curVal.Contains(valToAdd)) { return; } newVal = (curVal == String.Empty) ? valToAdd : curVal + ";" + valToAdd; Environment.SetEnvironmentVariable(varName, newVal, EnvironmentVariableTarget.Machine); } catch (Exception ex) { // message box to show error this.Rollback(stateSaver); } } } } </code></pre> <p>A reference to System.Configuration.Install is required for this code.</p>

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