If you need symbol files elsewhere than in the debugger, dotPeek provides a command to generate a PDB file (together with the source files) for any .NET assembly.
When generating symbol files, dotPeek creates the directory structure identical to the Visual Studio symbol cache. Therefore, if you set the Visual Studio symbol cache directory as the output folder, all generated symbols will be automatically available to the Visual Studio debugger. You can get or set the cache directory in Visual Studio Options: Debugging | Symbols | Cache symbols in this directory.
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Usage examples of PDB files are beyond the scope of this topic. For more information about PDB files, see this John Robbins' post.