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If any changes have been made to the format settings previously, deleting mimes.json will cause those changes to be lost. If losing those changes is not an option, the java/poi extractor can be added to the mimes.json file manually, if required. Please note, this is an advanced procedure and can cause HQ to not load, if done improperly. It is recommended to copy the original mimes.json file to a new location before deleting it. Using the old mimes.json file as a reference, add the settings to HQ using the UI as described above.
In some cases a rebuild of the mimes index may need to be rebuiltrequired. This can be done using the mimes api rest endpoint).