Chain extension after TU4

MHWilds chain extension is changed from 13 to 14
<img width="641" height="47" alt="Image" src="https://github.com/user-attachments/assets/2f37308c-f769-4231-99d1-7228b9ea1d03" />
Currently the chain editor can't import or export it.
Managed to fix it by changing the first byte inside the chain header from 0D to 0E and changing the extension. 