There isn't a single, dedicated "power window relay" in the same way some cars have relays for individual components. The 1990 Lincoln Town Car's power window system is controlled by a more integrated system, likely through the Body Control Module (BCM) or a similar central module. This module uses transistors and internal circuitry instead of separate relays for switching power to the window motors.
Therefore, you won't find a relay labeled "power windows." Problems with the power windows on that model usually point to issues within the BCM, the window switches themselves, wiring harnesses, or the window motors/regulators.
