Add an empty value for the registry key.

Author: stefankueng

src/Setup/Setup.wxs

@@ -55,7 +55,7 @@
             <RegistryValue Root="HKLM" Key="Software\Classes\Directory\Background\shell\BowPad" Name="Icon" Value='[INSTALLDIR]BowPad.exe,-107' Type="string" />
             <RegistryValue Root="HKLM" Key="Software\Classes\Directory\Background\shell\BowPad\command" Value='[INSTALLDIR]BowPad.exe /path:"%V"' Type="string" />
             <RegistryValue Root="HKLM" Key="Software\BowPad" Name="installDir" Value='[INSTALLDIR]' Type="string" />
-            <RegistryValue Root="HKLM" Key="Software\Classes\*\OpenWithProgids" Name="BowPad.file" Type="string" />
+            <RegistryValue Root="HKLM" Key="Software\Classes\*\OpenWithProgids" Name="BowPad.file" Value="" Type="string" />
             <RegistryValue Root="HKLM" Key="Software\Classes\BowPad.file" Name="AppUserModelID" Value='TortoiseSVN.Tools.BowPad.1' Type="string" />
             <RegistryValue Root="HKLM" Key="Software\Classes\BowPad.file\DefaultIcon" Value='[INSTALLDIR]BowPad.exe,-155' Type="string" />
             <RegistryValue Root="HKLM" Key="Software\Classes\BowPad.file\shell\BowPad\command" Value='[INSTALLDIR]BowPad.exe /path:"%1"' Type="string" />

src/Setup/Setup64.wxs

@@ -56,7 +56,7 @@
             <RegistryValue Root="HKLM" Key="Software\Classes\Directory\Background\shell\BowPad" Name="Icon" Value='[INSTALLDIR]BowPad.exe,-107' Type="string" />
             <RegistryValue Root="HKLM" Key="Software\Classes\Directory\Background\shell\BowPad\command" Value='[INSTALLDIR]BowPad.exe /path:"%V"' Type="string" />
             <RegistryValue Root="HKLM" Key="Software\BowPad" Name="installDir" Value='[INSTALLDIR]' Type="string" />
-            <RegistryValue Root="HKLM" Key="Software\Classes\*\OpenWithProgids" Name="BowPad.file" Type="string" />
+            <RegistryValue Root="HKLM" Key="Software\Classes\*\OpenWithProgids" Name="BowPad.file" Value="" Type="string" />
             <RegistryValue Root="HKLM" Key="Software\Classes\BowPad.file" Name="AppUserModelID" Value='TortoiseSVN.Tools.BowPad.1' Type="string" />
             <RegistryValue Root="HKLM" Key="Software\Classes\BowPad.file\DefaultIcon" Value='[INSTALLDIR]BowPad.exe,-155' Type="string" />
             <RegistryValue Root="HKLM" Key="Software\Classes\BowPad.file\shell\BowPad\command" Value='[INSTALLDIR]BowPad.exe /path:"%1"' Type="string" />