Conversion between .xlsx and .zip

Question

I want to manipulate Office Open XML format of Excel, but even just conversion between the .zip and .xlsx generates errors:

1. create a very simple test.xlsx by Excel
2. Right-click test.xlsx => Rename as text.xlsx.zip
3. Right-click text.xlsx.zip => Extract all to a folder named text.xlsx
4. Right-click text.xlsx folder => Send to => Compressed (zipped) folder named text_2.xlsx.zip
5. Right-click text_2.xlsx.zip => Rename as text_2.xlsx
6. open text_2.xlsx with Excel, then I got the following errors:

Does anyone know what's wrong there?

Answer 1

Xlsx files are just ordinary zip file and it is definitely possible to do what you are trying to do.

Does anyone know what's wrong there?

I would guess step 4:

4. Right-click text.xlsx folder => Send to => Compressed (zipped) folder named text_2.xlsx.zip*

You will need to zip the contents on the folder and not the folder itself. The resultant zip file should have the [Content_Types].xml files at the top level with no parent folder.