An open label, single arm Phase IIb study of olorofim (F901318) in participants with invasive fungal infections with limited treatment options. Participants received study treatment for up to 12 weeks in the main phase of the study. At the Investigator's request and after discussion with the medical monitor, open-label treatment with F901318 could be continued in patients judged by the Investigator to need therapy beyond 84 days and considered likely to continue to benefit from extended treatment.