You can override Files module configuration by publishing the addon and modifying the resulting configuration file:
php artisan addon:publish anomaly.module.files
The addon will be published to
anomaly.module.files::mimes.types value tells the files module what
type of file is associated with a given file extension.
If your project deals with strange file types feel free to add them here under the appropriate type.
If you think an extension should be included in configuration please submit a pull request!