How to properly assemble a valid xlsx file from its internal sub-components?

Question

I\'m trying to create an xlsx file programmatically on iOS. Since the internal data of xlsx files is basically stored in separate xml files, I tried to recreate xlsx structu

Answer 1

If I decompress an xlsx file into a folder and then I recompress it again, the xlsx becomes corrupt / not recognized. In my case, the cause is that my zip tool is using the folder name as the first level for the relative path of each file inside the zip.

I have solved the problem by creating an empty zip file INSIDE the folder with the xlsx contents and then adding all the files and folders to it.

Actually, if you try to zip the folder itself, the file is not a valid xlsx. You should rather go inside the folder, select all the contents and then right-click & zip.