I recently migrated from WCS to NCS and since the migration all the reports are being sent inside a zip file. I remember having this issue when I first installed WCS many years ago, however I am unsure what was done to correct it. I have checked the Administration section of NCS to try and find the setting but no luck or within the Report Launch pad on any of the migrated reports or the new reports.
I don't want them sent as zip files but as either native CSV or PDF as specified within the appropriate report. The reports are never that big to need compressing into a zip plus the mail server they send through will accept up to 20-25MB attachments which is much greater than the native size of any of the reports generated through NCS or WCS.