Build 4.0.0.21 of xlsgen adds the following objects in the XLSB output (support for writing XLSB files is introduced in xlsgen 4.0, and is a binary version of XLSX files aimed at improving the speed for reading and writing large spreadsheets) :

- advanced conditional formattings
- hyperlinks
- comments
- data validations
- freeze/split panes
- auto filters and custom filter expressions

Build 4.0.0.20 of xlsgen improves the speed at which XLSX files (and their variants) are read. Half encoding calls removed, resulting in up to 10% imrpovements for reading files. Particularly noticeable with large files.