Set DSCP based on application or destination IP (Windows XP)

I have a couple of computers ruing on XP (can't upgrade the O.S. without updgrading the hardware and currently we can't afford it) that run an specific application. The application uses a database on a central server (ruing 2012 R2).

I would like to prioritize the traffic from/to the computers to/from the server, so that I could speed up that application. I have a switch with administration capabilities (HPE 1620) that supports DSCP.

I've seen that on Windows 7 I can set a DSCP mark to the traffic from an specific application (Policy Based QoS). But I didn't found something alike on Windows XP. How can I force my etheet frames to have an specific DSCP value if the are generated from an specific application? Or at least to set the DSCP value based on the destination IP (the server IP)?

Thanks Gonzalo.