VS Solution Explorer Item Custom Command

1. Add entry to “External Tools”, e.g. Wscript.exe with $(ItemPath) and $(ItemDir)
   count (1-based) which entry this is.
2. “Customize…” then
   in  “Commands”->”Context menu”
   select “Project and Solution Context Menus | Item”
   and add entry “Tools->External Command [n]”  with [n] from your external command.