In a May Anaplan release the platform was updated such that when users in classic dashboards created a new ad-hoc export, the default file format was now .csv, not .xls. In many respects this was an improvement and certain customers preferred the .csv setting, but some customers need the files to be in an Excel format and now the action to override the new default was an inconvenience for users. The request is that we either have an option for the default, so that customers can select the default they want, or to change the default to .xlsx (like New UX pages default) or back to .xls.
This is picking up from a discussion in a different Ideahere.