Hello there, the vector file contains all the faces grouped and organized, you can just select the face you want simply by clicking on it. then you do whatever you want with it. You could paste onto a new blank file, and save it in the format you desire.
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As a normal user, I don't have the proper application to open vector file, neither I have knowledge manipulate the vector file. That is why I decide to purchase the assets intead of making my own.
I think you already have the vector face file separately, you just need to package them into a zip file and upload them. People who does not have related skill like me will be more willing to purchase the assets