I want to edit simple table data in Excel 2010, which is to be stored only in a flat text format (i.e. not a binary format like XLS or XSLX) which is viewable with notepad and can be read by a simple program and easily viewed in a git diff.
I would like to be able to use Open/Open With directly in Windows and then Save again to update the file directly without needing to import or export the data to said text file from a binary master.
For now, localization differences is not an issue as I will be the only user. When that changes we will most likely move to a database.