GhostwheelX
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On the PFSRD under the Mounted Combat section, it is written that when your mount charges, you gain the drawback and advantage of charging (-2 to AC and +2 to attack), but it does not say that it is actually a charge action for the rider.
Therefore, you could make just about any attack at the end of your mount's charge--not necessarily a charge attack. Thus, could you use Vital Strike at the end of your mount's charge by taking an attack action at the end of the charge?