This is a good story on the problems of proprietary file formats, which has a happy ending but only through what appears to be days of effort and some Open Source tools.
I really don’t know why customers put up with vendors shipping undocumented private file formats. It just locks up your data.
Purchasing should be requiring Open File Formats for any piece of software that is purchased – it should be an absolute corporate mandate. Sadly the purchasing playbook has yet to get a section on probably one of the most business-critical aspects of scientific computing.