.kdfiles is a bit temperamental. A couple of things:
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The paths much match exactly. That is \Windows\System32\ntoskrnl.exe and c:\windows\system32\ntosnkrnl.exe are not the same thing.
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Try setting the _NT_KD_FILES environment variable.
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Check out “Mapping Driver Files” in the WinDbg documentation. It is in the index, unlike .kdfiles
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It has been a long time since I have tried this, but as I recall, the order of lines in the map file mattered sometimes as well. I’m not sure about this, but that is what I recall.
Good luck,
mm