I wrote this mainly for me, but in case someone wants it for the same reason I wrote it, here's brief overview. The reason I wrote it is because I couldn't find any MD5 sum apps that did exactly what I wanted: Accept a file as a command-line parameter and compare the resulting MD5 sum with the text in the clipboard. I use it with FreeCommander and I assume it could be used with Total Commander as well. It closes with the Escape button, so it takes one keystroke to run it, and another one to close it.
Comments are welcome.