Excel: Edit the XML inside an XLSX file
Excel: Edit the XML inside an XLSX file
Excel: Edit the XML inside an XLSX file
Re: Excel: Edit the XML inside an XLSX file
How are you going about doing the editing? I would suggest not fully extracting the file, but instead, just opening the archive in 7-zip. Then, find the file you want to edit, choose "edit", then save it and 7-zip should automatically replace it in the archive. In the past when I've done this, Excel has then opened it up without any trouble, but when actually extracting then recompressing it, I've had issues.