Gets the default file extension for the specified format.
The format requested.
A string containing the file extension for the specified format (without the ".").
This method will return the default file extension commonly used with file of types format. For example, JPEG files commonly have "jpg" extensions, Adobe PDF files commonly have "pdf" extensions and so forth.
This method returns an empty string for formats such as DICOM that do not have a common file extension.
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