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When you open the file of Minimal Board Editor with text editor, be careful to the character code
The data file of Minimal Board Editor is a text file.
You can open .MB3 files and edit it with text editor if you want.
But be careful to the character code of the text editor.
Some text editors mistakes the character code of .MB3 file for UTF-7.
when you open the MB3 data with text editor, see the first line.
if it does not start with "+MBE_DATA", it means that the text editor misidentified the character code.
It is the screenshot of Sakura Editor opened MB3.
If you edit this data and save file, data will be broken.
Reopen this file as UTF-8 before editing.