Where (and how) to put PDB files for custom .NET code?

Our developer sent me a PDB file to help debug a custom application. I currently have my symbol directory set to c:\symbols, and several Microsoft symbols are there in this folder format:

ntdll.pdb | -----GUID | ----> ntdll.pdb

If the developer gave me a PDB named LL.SharePoint.Portal.pdb, how would I correctly place it into my symbol store? What value should be used for the GUID?

From serverfault Jeff Costa

• I think you can just get away with putting it in the same folder as the (offending) DLL.

  Rowland Shaw : In addition, you may find there are more people with windbg knowledge on stackoverflow.com
  From Rowland Shaw