File list (Check if you may need any files):
Article_src\Contracts\Contracts.csproj
...........\.........\IComponent.cs
...........\.........\Properties\AssemblyInfo.cs
...........\ExportMultiplyLib\ExportMultiplyLib.csproj
...........\.................\MultiplyOfNumberComponent.cs
...........\.................\Properties\AssemblyInfo.cs
...........\......SubstractLib\ExportSubstractLib.csproj
...........\..................\Properties\AssemblyInfo.cs
...........\..................\SubstractOfNumberComponent.cs
...........\........mLib\ExportSumLib.csproj
...........\............\Properties\AssemblyInfo.cs
...........\............\SumOfNumberComponent.cs
...........\ImportingLib\Importer.cs
...........\............\ImportingLib.csproj
...........\............\Properties\AssemblyInfo.cs
...........\MEFApplication\bin\Debug\Contracts.dll
...........\..............\...\.....\ExportMultiplyLib.dll
...........\..............\...\.....\ExportSubstractLib.dll
...........\..............\...\.....\ExportSumLib.dll
...........\..............\...\.....\ImportingLib.dll
...........\..............\...\.....\MEFApplication.exe
...........\..............\...\.....\MEFApplication.vshost.exe
...........\..............\...\.....\MEFApplication.vshost.exe.manifest
...........\..............\MEFApplication.csproj
...........\..............\Program.cs
...........\..............\...perties\AssemblyInfo.cs
...........\Simple MEF Example-1.sln