Opening of dead simple xslx files fails

[Alexander Casassovici]

Hi guys,

I've used roo successfully in the past but this kind of files (generated through a third party webservice) seems to break it (silently, return an unusable object with no #inspect info ... which basically means it failed silently)

I think it's because the xslx file is missing a lot of the usual file structure (styles...) but I'm basically clueless..

Any idea appreciated!