Inside a slightly bizarre car to "mains" adaptor.

I'm not sure what to make of this. It's technically intriguing but I'm struggling to work out its purpose other than possibly being for running older plug-in power supplies for equipment that doesn't use a standard USB style connector.
The device also has a very badly implemented USB port that is powered from a small linear regulator that is going to struggle at anything more than a few tens of milliamps on 12V and less on 24V.
The mains socket on the front actually puts out DC at a voltage that floats between about 90V to 200V+, so is only suited to universal switchmode power supplies that already convert the incoming mains to DC. It won't drive a capacitive dropper style lamp or an adaptor with a traditional transformer.

A particular oddity about the high voltage section is that it has a 100K resistor and LED across the main smoothing capacitor that can see in excess of 200V. It may be doubling up as a crude regulation load to stop the voltage peaking too high and also to help rapidly discharge the capacitor when the power is turned off. But the eighth watt resistor will be dissipating almost half a watt on a light load and will probably smoke quite quickly.

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