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אם מישהו מכיר תוכנה כלשהיא, תודה.
@לאוניד חיפשתי קצת https://www.file-extensions.org/gbc-file-extension#actionsanchor
https://www.google.com/search?q=gbc+file&oq=gbc+file&aqs=chrome..69i57.5659j0j7&sourceid=chrome&ie=UTF-8
