When I try to open an mkl file (created by ORCA's orca_2mkl utility, with the express purpose of viewing with MOLEKEL), I get the following error: Cannot read file: /home/hf63/Dendrimers_2/Charges_and_geometries/POSS-vbp0-zindo.mkl with OpenBabel Is this format not supported (the ORCA manual advertises the utility program explicitly for using MOLEKEL), or do I have to open it some other way? Thanks in advance, Herbert

You should use Molekel 4.3 to visualize .mkl files.

Well is it possible to convert any .mkl files to one of the new openbabel formats? I have lots of .mkl files but would like to use the new features and even if I had to convert them it would be easier than rebuilding new files from scratch. Thanks in advance for any info or script to achieve this.