What about %USERPROFILE%\AppData\Roaming\SQL Developer\CodeTemplate.xml ?
That documentation refers to the "hidden" Application Data folder, from the old Windows XP days, which changed to AppData (or, more accurately, AppData\Roaming) in Vista.
And there is no export / import feature for code snippets in the SQL Developer UI currently, but you can always edit the UserSnippets.xml
Thank you. Found the files, will check to tamper this, when I'm back from holidays.