The Wurth *.dat files are non-sequential Source File objects.  The files should be downloaded and then placed in the Documents\Zemax\Objects\Sources\Source Files folder.  A particular file can be selected when inserting the Source File object.  If you pick a very large number for analysis rays, say 1e09, then OpticStudio will provide the max number of available rays in the file.  More detail about the file format can be found in the help documentation.

Regards,

Jeff

Thank you very much for the help.  I’m still getting used to importing source files.  Really appreciate it.