Does Manifold IMS Release 8 support WMS GetFeatureInfo? I've tried altering the request 1,000 ways with no success and it seems others had no success in the forums as well. Am I wasting my time?

http://localhost/manifold/wms.asp?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetFeatureInfo&FORMAT=image%2Fpng&TRANSPARENT=true&QUERY_LAYERS=Line&LAYERS=Line&INFO_FORMAT=text%2Fhtml&EXCEPTIONS=text%2Fhtml&X=58&Y=189&WIDTH=256&HEIGHT=256&SRS=EPSG%3A4326&STYLES=&BBOX=-95.99853515625%2C48.31787109375%2C-95.987548828125%2C48.328857421875

M8 WMS does not support GetFeatureInfo (it is optional in the WMS standard).

It does support WFS though (GetFeature, etc), you can try using that.