I opened a support case and this is what QB sent me. My users in Europe followed the instructions and can now save as a spreadsheet successfully.
"I did some digging and it appears this is an issue with csv files and how they are handled in Excel based on the region settings. If the computer is set to a region which does not use the comma as the list separator, a csv file using commas as the separator will not open properly. Below is a link to a Microsoft help article discussing how to import a .csv file into Excel and at the bottom it walks through the steps to change the separator for .csv files. I have also included another link to a Excel User forum post which discusses this issue.https://support.office.com/en-ie/article/Import-or-export-text-txt-or-csv-files-5250ac4c-663c-47ce-937b-339e391393bahttps://superuser.com/questions/407082/easiest-way-to-open-csv-with-commas-in-excel"