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Err

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I might be the last person to know this but one of my favorite internal Microsoft tools is now external.  Err.exe is a command-line tool that looks up error codes and spits out possible matches from various header files.  This is invaluable when you're reading through a log and run across something like "Failed, err 0x80070003" -- just run err and you'll find out what this possibly means:

C:\Users\Neilcar\Downloads\Err>err 0x80070003
# for hex 0x80070003 / decimal -2147024893 :
  COR_E_DIRECTORYNOTFOUND                                       corerror.h
# MessageText:
# The specified path couldn't be found.
# 1 matches found for "0x80070003"

The download for err is available at https://www.microsoft.com/downloads/details.aspx?familyid=be596899-7bb8-4208-b7fc-09e02a13696c&displaylang=en.  Download it and extract it to somewhere in %PATH% so that it's only a command prompt away.