Total Commander extDir - "Installing" to TC's main directory
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Steps:
 
01. Close Total Commander's every instance. 
 
02. Open your "usercmd.ini" file [usually its in "%APPDATA%\Ghisler\usercmd.ini"] - if it doesn't exists, just create a new file with this name, then add the following lines (use the current path of your Total Commander instead of "c:\totalcmd\", if it has been installed to another directory):
 
[em_extDir]
button=c:\totalcmd\tc extDir.exe
cmd=c:\totalcmd\tc extDir.exe
path=c:\totalcmd\
 
03. Save the file, and you're done.