use ObjectFormatInfo libclient utility to look up mimeType and filename extension during get() calls. Configurable mapping file is deployed by default to /var/metacat/dataone where it can then be augmented as needed. This location is controlled in the metacat.properties file (which is injected into the DataONE Settings values during weapp intitialization).
# Configure the Member Node client certificate location
# Client resources
# Member Node configuration
dataone.subject=CN=METACAT1, DC=dataone, DC=org
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