Because pseudopotential is used for Pt in the HF-3c method, you need to properly modify the [Atoms] section of the molden file produced by orca_2mkl, so that Multiwfn can recognize the actual effective nuclear charge of Pt. Please check "Molden input file" paragraph in Section 2.5 of Multiwfn manual, and http://www.shanxitv.org/wfnbbs/viewtopic.php?pid=721Alternatively, you can simply use ORCA 6.0 or later, then you do not need to manually modify the molden file.
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