Zeno R.R. Davatz

I kind of a agree and if you have an idea how to "fail nicely" if spreadsheet gem can not process "an XLS" file then please submit a patch with...

Interesting, thank you for this report. Why do you want to create a file like this?

that is possible. Can you share your produtive code here?

Ok great. I think it is a problem in your script. So it is good if you create a standalone example that replicates your problem. Looking forward to seeing it.

Are you adding information to an existing file or are you creating a new file with your spreadsheet script? Yes, and if you are using Rails, you should try to...

so spreadsheet creates the XLS file?

Have you tried to write a simple function to create a new XLS file with spreadsheet, separate from your application?

How many MB is the file that you try to write but fail?

how was the Excel file created? Which software created the original XLS file that you are trying to edit?

So the original file was XLSX? XLSX is XML, where XLS is a binary format. We only support XLS. You should also try the LibreOffice commandline tools.