Before analysis make sure you have administrative privileges to run the data collection.
Support Limitations for Windows Store C# Application Analysis
Starting from Microsoft Windows 8*, all Windows Store C# applications are automatically pre-compiled with the NGEN service during each 24 hours. VTune Amplifier cannot resolve Native Image methods since symbol information for these methods is absent. As a result, when you profile a pre-compiled application with the VTune Amplifier, you have [unknown] function entries instead of C# methods. You can either generate .pdb files for native images via the Ngen.exe tool or temporarily workaround this problem until the next automatic NGEN pre-compilation:
Locate automatically pre-compiled assemblies. Typically 32-bit assemblies are located in C:\Users\Administrator\AppData\Local\Packages\<package>\AC\Microsoft\CLR_v4.0_32\NativeImages\ and 64-bit assemblies are located in C:\Users\Administrator\AppData\Local\Packages\<package>\AC\Microsoft\CLR_v4.0_32\NativeImages\ folders.
<package> varies with applications. To identify the package, use any of the following options:
Open the Task Manager and check the properties for your application. The General tab contains the package value including the version that should be omitted. For example, if the General tab displays 47828<app_name>_188.8.131.52_neutral__sgvg9sxsmbbt4, then NGEN'ed modules are located in C:\Users\Administrator\AppData\Local\Packages\47828<app_name>_sgvg9sxsmbbt4\AC\Microsoft\CLR_v4.0_32\NativeImages\.
Use the Process Explorer tool: explore the list of modules loaded in the application, find *.ni.exe modules and get their location.
Rename the folders that include *.ni.dll or *.ni.exe. For example, rename C:\Users\Administrator\AppData\Local\Packages\47828<app_name>_sgvg9sxsmbbt4\AC\Microsoft\CLR_v4.0_32\NativeImages\<app_name> to C:\Users\Administrator\AppData\Local\Packages\47828<app_name>_sgvg9sxsmbbt4\AC\Microsoft\CLR_v4.0_32\NativeImages\<app_name>.
Re-start your application.
CLR JIT-compiles the methods. You can use the VTune Amplifier to profile your C# application until the next automatic NGEN pre-compilation.
This workaround is not recommended for .NET* Framework libraries (for example, mscorlib.dll).