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Open up foobar, go to Preferences (shortcut Ctrl+P), expand Display, click on Album Art Panel and select Sources. On selected code, change from folder.jpg to wildcard (*.jpg), then foobar should read whatever your picture filename would be, as long as it jpg format

Obsolete or not, the purpose of using ASIO4ALL is to get bitperfect out from your card, it doesn't matter how old is the driver

The reason why some resample to 48kHz because their cards (usually old AC97 based codec and Audigy series cards, which resamples everything to 48kHz) have bad resampling algorithms that create intermodulation distortion that even software can do it better, so they resamples the source first before the DSP itself do it.

About resampling in foobar, there is resampler in DSP Manager, but I don't know how it done in Vista as I never ever use Vista

Replay Gain acts like a normalizer, it normalize all the selected tracks so you don't have to adjust the volume when changing track. Its up to you whether you want to use it or not, try to do some testing, if you like it use it.

Be wary though that it might cause distortion, as it makes the quieter track louder if its mixed with louder track. I don't know how effective this Replaygain is as I never use it.

Read about it here