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MSG Previewer

MSG Previewer is an outlook message (.msg) preview pane for 64 bits Windows. Microsoft doesn't support the a 64 bit previewer for .msg extension in windows explorer. These dll files will make it work.
64 bit .msg preview pane for windows explorer

Installation instruction

Download dll files
You can put them anywhere you like, preferable a path you can type easily. In below example i've put them under d:\MSGPreviewer

You also need .NET 4.5 , a newer version is good too.

Now you need to run Command line in administrator mode. You can do this by create a shortcut to cmd.exe and right mouse click and choose run as administrator.

Goto the directory: C:\Windows\Microsoft.NET\Framework64\v4.0.30319 , by typing: cd C:\Windows\Microsoft.NET\Framework64\v4.0.30319

the type there two commands:

regasm /tlb d:\MSGPreviewer\SharpShell.dll
regasm /codebase d:\MSGPreviewer\msgpreview.dll

This will register the dll files as com object and the previewer should work now.