There is no separate exe for the mission editor, it's integrated into the game engine.
Select Windows->Start->Programs and navigate to the Lighthouse folder
there you find a subfolder called "Editors and Utilities"
or create a shortcut on desktop to "Steel Fury - Kharkov 1942\bin\rel\shell.exe" and add as param "root\programs\misedit.program"
example:
"F:\Steel Fury - Kharkov 1942\bin\rel\shell.exe" root\programs\misedit.program