In AutoPLANT modeler most of the companies use their standard template for generating Isometric. OPIM uses default seed file (isoseed.dgn) as template for generating isometric. Any file with extension excluding .DGN will not support it.
Following steps will aid user for converting existing dwg template to default seed file.
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Sean. You are correct the style will only use a seed file named "isoseed.dgn". I updated the wiki.
Should the file to copy be isoseed.dgn , not seed.dgn?