Patch for Store apps referencing C++ extensions

Update (Apr 3, 2014)
This patch is now included in the latest XAML Spy Update. There is no need to apply this patch when you have the latest version of XAML Spy installed.

A patch for XAML Spy is now available addressing an issue that may occur in Windows Store apps when referencing one or more C++ extensions.


When using XAML Spy on a Windows Store 8.0 or 8.1 app, the XAML Spy property grid may display the following error: An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B).

The error is caused by XAML Spy incorrectly trying to load an unmanaged library for reflection purposes.


Follow these steps to resolve the issue

  1. Download the patch
  2. Unzip and extract the contents to [XamlSpyInstallDir]\Libraries\WinRT. You'll need to overwrite the existing assemblies. The default XAML Spy install folder is C:\Program Files\First Floor Software\XAML Spy, or C:\Program Files (x86)\First Floor Software\XAML Spy for x64 systems.

The fix will be included in the upcoming XAML Spy update.

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