If it was packaged in a .rar is was most likely made before V9 and does not work with V9+
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tried and failed to open the model in Blender
You tried to open the .dts, didn't you?You're a moron. Why do you even want to do that? Porting doesn't involve editing the model. The only program with a .dts importer is Shaper, and I don't trust it.