Azelor,

When you create via File >> New >> Binary File, you don't have the option to set min and max elevations (that I can see).

Instead, you see the following:

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The interesting thing is that if you change the value circled in red to 15 instead of the default 0, the entire world has an altitude of 15 on import. So, there is either something wacky with the MDR or with FT3's import process.