As explained in Tav's manual (http://tavmjong.free.fr/INKSCAPE/MANUAL/html/File-Import.html), the "Edit externally" command works for linked bitmaps only. If you have an embedded bitmap (or a bitmap copy of an SVG object), the command is grayed out.
Could you please confirm the bitmap you're trying to edit is embedded and not linked?
As explained in Tav's manual (http:// tavmjong. free.fr/ INKSCAPE/ MANUAL/ html/File- Import. html), the "Edit externally" command works for linked bitmaps only. If you have an embedded bitmap (or a bitmap copy of an SVG object), the command is grayed out.
Could you please confirm the bitmap you're trying to edit is embedded and not linked?