Allowing multiple mime types per extension

[JZubero]

There are file formats with more than one official mime type. e.g. Photoshop files, which have .psd as extension and possible mime types:

• image/vnd.adobe.photoshop
• application/vnd.adobe.photoshop
• application/x-photoshop
• application/photoshop
• application/psd
• image/psd

Is there a way or recommendation how to account for this?