Build 3.5.0.59 of xlsgen fixes a problem related to conditional formattings in XLS and XLSX files.
Conditional formattings with no formatting were regarded as useless so far, so xlsgen would not preserve them. For the sake of file integrity, beginning with this build, such conditional formattings are preserved. And it is possible to create new conditional formattings with no formatting in XLS and XLSX files.