I believe MC can only import MPL files (a type of XML). I've often wondered how I might convert Excel data to MPL, but an easy answer always seems just beyond my reach. But
justsomeguy recently demonstrated how it can be done using VBA in his
Track Year Lookup for Best of and Greatest hits albums. It includes a function for exporting its results to an MPL playlist for importing into MC.
But I see you've already discovered that topic. It will do the job for you. Don't be thrown off by the fact it seems to have some difficulty
importing MPL. You don't need that, and it exports to MPL just fine. You might have noticed my comment...
When you released a new version, I tried moving the list I was working on into the new version of the workbook. I used the Excel function for moving/copying a sheet from one workbook to another. When the sheet was in the new workbook, I was unable to load it as the "Working List." I can't remember how I resolved that exactly. Something like re-loading the original list, and then cutting & pasting the current list contents into it.
Hopefully, that will be resolved, but—as I indicated—the difficulty can be overcome.
Maybe justsomeguy will take pity on us and create a separate VBA workbook that simply exports
any sheet (i.e., whether it originates from MC or elsewhere) to MPL. It would be nice if it also imported MPL.