Contributes to the formation of crescents and immature virions (IV). Interacts with phosphatidylinositol-3-phosphate (PI3P) and phosphatidylinositol-4-phosphate (PI4P) lipids in order to form virion membranes. Probably transitorily part of the membrane of crescents during immature virions formation. Not incorporated into virions. Probably synthesized, but not retained in viral factories. Expressed in the late phase of the viral replicative cycle. Belongs to the chordopoxvirinae H7 family.