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It should contain:

MimeType=image/png;image/gif;image/jpeg;image/bmp;image/x-pixmap;image/tiff;image/svg+xml;image/x-xpixmap;

Fixed in http://git.xfce.org/apps/ristretto/commit/?id=2c8316ef039037cba52f80c987b6b95e5cd33be3