Such as .pls and a few others that are common.
.pls are supported. I’m currently listening to (the UK only) http://open.live.bbc.co.uk/mediaselector/5/select/version/2.0/mediaset/http-icy-aac-lc-a/format/pls/vpid/bbc_radio_three.pls
I’ve now found it works for some for me, not for others. Not sure why.
Some streams are limited to certain countries. Might that be the problem?