In a Windows environment, the CATDOC program xls2csv, doesn't work if it's merely in the system path. It throws up an error about missing parts, which are in its subfolder. But it works correctly from outside its folder if you point to it directly from a DOS prompt: c:\myfolder\xls2csv.exe. So it should also work within XLS.PY if I can insert my full path: c://myfolder//xls2csv.exe.
I tried to edit XLS.PY in the converters folder, but after restarting Plone, there's no updated PYC. I just need a hint about how to tweak the code. Thanks.