@olaviivalo

The "sys.txt" is a plain text format file, you can edit it with any text editor like notepad.
This file were located in your iGO program folder, please reference the pic below:
Spoiler: Where is the "sys.txt" file?
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If you still do not understand, I am afraid I can not help,
because my bad English seems to have caused some inexplicable misunderstanding.