Does anyone know if there's a guide to interpreting chkdsk results?

In particular, I'd like know what file or directory an index number refers to.

In the absence of better information, you may find the following URLs useful, even though they do not directly answer your question.

Sysinternals File and Disk Utilities:
http://technet.microsoft.com/en-us/sysi ... 45046.aspx

NTFSInfo v1.0:
http://technet.microsoft.com/en-us/sysi ... 97424.aspx

Tip: How to determine which file occupies a particular sector:
http://forums.seagate.com/t5/Barracuda- ... 567#M15364

Here is the usage info for nfi.exe:
http://www.users.on.net/~fzabkar/temp/ph3nfi.htm