I’m writing monstrous spreadsheets that are 200K x 350 columns wide.  I need to write 4mm rows over say 20 workbooks.   I’m worried about memory.  I was able to to create most of them using the standard aspose functions,…...dropbox.com/scl/fi/z2iecgwn0nrt2zn...am0yprng&dl=0 https://www.dropbox.com/scl/fi/47siur930wjhth4...