Post any defects you find in the released or beta versions of the ImageMagick software here. Include the ImageMagick version, OS, and any command-line required to reproduce the problem. Got a patch for a bug? Post it here.
there is a conflict in the magic map causing issues with ImageMagick trying to determine old PCL files and guessing HPGL. This then causes ImageMagick to pick the hpgl delegate to decode.