I'm continuing to develop Morse Telegraph Key. And Tryhest shared his Morse code player as his comment to the last my post.
Morse code player by Tryhest
This program SVP811 downloads Morse code audio files from Wikipedia and plays them. It needs LitDev Extension. To run this program I rewrote the drive letters "e:" to "d:" for my PC.
Second step for Morse Telegraph Key
This version NHT122-0 shows Morse code as you type (any keys except space or return). The goal of this program will be converting Morse code to Alphabet. Thanks.