import – Digikam: What is the extension of the exportet keyboard shortcut scheme?

With digikam 5.6.0, I can export shortcut schemes.
(Menu: Settings → Configure Captures … → Schema Management »→ Other Actions → Export Schema)

The result is a file without extension (content in the typical ini format)

However: how to import again? The filter shortcut from the filter file dialog box to Something, but I just do not know what extension … no chance to guess …

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