Major envelope protein that plays a role in the biogenesis of the viral double membrane and in egress of virus from the host cell. Produces the wrapped form of virus that is required for cell-to-cell spread. Acts as a lipase with broad specificity including phospholipase C, phospholipase A, and triacylglycerol lipase activities. Interacts with protein B5. Component of the inner side of the enveloped virion (EV) membrane. F13 is associated post-translationally with membranes. Late-budding domains (L domains) are short sequence motifs essential for viral particle budding. They recruit proteins of the host ESCRT machinery (Endosomal Sorting Complex Required for Transport) or ESCRT-associated proteins. F13 contains one L domain: a YPPL motif, which might interact with PDCD6IP/AIP1 (By similarity). Palmitoylated.