OpenFileTC -how I can add new app?

[damat]

I want to add DjVuReader to F3 viewer. I haven't guessed how I can do it in GUI, though guessed to edit ini files directly:

Code:

[Program11]
Name=DjVuReader.exe
FullPath=%COMMANDER_PATH%\PLUGINS\Media\DJ\DjVuReader.exe
SupportedExts=djvu
_OpenAtOnce=1
_CmdLine=%1
OpenAtOnceForAnyExt=0
ForceRunOnAnyExt=1

DjVuReader appeared in the list of applications but when I press F3 on djvu file, I have an error:

Format of the file <_.djvu> couldn't be determined.

What's wrong?