SNMPv2-TC: View SNMP OID List / Download MIB
Download standard MIB format if you are planning to load a MIB file into some system (OS, Zabbix, PRTG ...) or view it with a MIB browser. CSV is more suitable for analyzing and viewing OID' and other MIB objects in excel. JSON and YAML formats are usually used in programing even though some systems can use MIB in YAML format (like Logstash).
There are no Object Identifiers (OID) to display! This is probably a standard MIB that is imported by other MIB's