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The file is operating the way you designed it to.
And you have control over this.
If you are not using FileMaker 15-specific features, it can work fine in 14; or earlier versions.
The extension remains the same in any case. (fmp12).
You control this under File Options, where you can specify Minimum Version.
Was not aware of this setting / feature… thanks!
Bruce's answer was the correct one. Not yours.