It is a FREE productivity tool which decompiles .NET 1.0 - .NET 4.5 assemblies to C# code and has support for .dll, .exe, .zip, .vsix, .nupkg, and .winmd files.
http://download-ln.jetbrains.com/dotpeek/dotPeekSetup-1.0.0.8644.msi
Rajesh Patel
R.P.A Developer | Developer Trainer | Clean Code Evangelist