I’ve got to be able to save to xlsx so I can return files to coworkers, but when I save them they’re gigantic compared to the xlsx version saved out of Excel. I see posts when googling that suggest this issue went away with 3.6, but I’m seeing it in 4.2.8.2 on 64bit windows 7.
Please edit your question to indicate specific file sizes. Thanks.
It is possible that the size difference is due to font embedding (which can be turned off). Since XLSX is a zipped format, perhaps open the files using an archive manager to determine where the size difference is occurring?