The files in this directory are the data files required for smb-psexec.nse.
The .lua files are configurations. Each of these defines a profile for a
psexec execution.
nmap_service.exe is a program that facilitates the operation of smb-psexec.nse.
It is uploaded to the remote host and runs the programs it's directed to run,
redirecting their output to a file. This file is then downloaded by the
script and displayed to the user.
When Nmap released version 5.20, it was discovered that some over-zealous
antivirus software tagged this program as spyware[1]. For that reason, when
stored on the host machine, it is now encoded by xoring every byte of the
file with 0xFF. When uploaded to a target machine, it is decoded in-stream.
This prevents programs on the host machine from tagging it as malicious, but
does not prevent the target from detecting it (which is arguably a good thing).
The encoder.c program reads a program from stdin, encodes it by xoring with
0xFF, and writes it to stdout.
[1] http://seclists.org/nmap-dev/2010/q1/198
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