When downloaded, exported quiz reports should be named like:

course_shortname-quiz_name-responses.extension

If the shortname of a course or the name of a quiz module contains an '&' character, when downloaded the export file will not be named correctly and will not have a proper file extension (.csv, .xslx, etc)

Steps to reproduce:

• Create a course with a shortname with an ampersand (EG 'Quizzes & stuff')
• Add a quiz activity with at least one attempt
• Navigate to the quiz report (grades, responses, or statistics)
• Attempt to download the table data
• Observe the download file is "Quizzes amp'
• Change the course shortname to remove the & (EG 'Quizzes and stuff')
• Download the quiz report table data and confirm it works normally