.DOC and .XLS are old formats. Please can they be updated to the latest versions, which have been around for a while now.
Screenshot from Registration - Reports - Individual Register Report.
Seems to be the same choice of report formats throughout the Registration module.
The selector for custom reports in Student Manager also only allows for older Office file formats (.doc and .xls) as per the attached screenshot. We're increasingly finding that this causes problems with exported files that are used with Sharepoint as formatting is often lost unless we, for example, open an exported xls and re-save it as an xlsx. This is a minor headache when handling one or two files but a much bigger waste of time when dealing with hundreds at a time.
Thank you for bringing this to our attention. We worked to change the file formats several years ago, but it would appear that these were missed. Please would you raise a ticket with the support desk to raise this as a bug - you can mention that you raised this on the Ideas Portal and I redirected you to the support desk.