is it possible to use as unity editor window?

[nicodrive]

No description provided.

[Meragon]

Yes, it is possible, but complicated and you will need to change some source code.
Basically you need to duplicate UnityWinForms class, make it derive it from EditorWindow, call Awake manually when you showing a window, set line 67 to

gResources = Resources.FindObjectsOfTypeAll<UnityWinForms>()[0];

and also change lines 116 to 121 to use local resources, then you want change method GUI_SetFont in UnityGdi class or somehow manage resource pointer by your own, and then change UpdateMouse & UpdateKeys methods in your new class so they can acquire mouse and key events from editor window. And also call Repaint method in Update.

But yeah, it's not supported #17 , and I don't think it's reasonable right now to make it happen.