Real .xlsx export

[EPTamminga]

Is your feature request related to a problem?

Please describe.
The xls export is a workwround: HTML table file wit extension .xls

Describe the solution you'd like

Real .xlsx file output

Additional context

This seems to have a lot of usage and support out there.
https://www.nuget.org/packages/FastExcel/

[stale]

We have detected this issue has not had any activity during the last 180 days.
That could mean this issue is no longer relevant and/or nobody has found the necessary time to address the issue.
We are trying to keep the list of open issues limited to those issues that are relevant to the majority and to close the ones that have become 'stale' (inactive). If no further activity is detected within the next 21 days, the issue will be closed automatically.
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Thank you for your continued involvement and contributions!

[WillStrohl]

Still relevant.

[stale]

We have detected this issue has not had any activity during the last 180 days.
That could mean this issue is no longer relevant and/or nobody has found the necessary time to address the issue.
We are trying to keep the list of open issues limited to those issues that are relevant to the majority and to close the ones that have become 'stale' (inactive). If no further activity is detected within the next 21 days, the issue will be closed automatically.
If new comments are are posted and/or a solution (pull request) is submitted for review that references this issue, the issue will not be closed. Closed issues can be reopened at any time in the future.
Please remember those participating in this open source project are volunteers trying to help others and creating a better DNN Platform for all.
Thank you for your continued involvement and contributions!

[WillStrohl]

Still relevant.

[stale]

We have detected this issue has not had any activity during the last 180 days.
That could mean this issue is no longer relevant and/or nobody has found the necessary time to address the issue.
We are trying to keep the list of open issues limited to those issues that are relevant to the majority and to close the ones that have become 'stale' (inactive). If no further activity is detected within the next 21 days, the issue will be closed automatically.
If new comments are are posted and/or a solution (pull request) is submitted for review that references this issue, the issue will not be closed. Closed issues can be reopened at any time in the future.
Please remember those participating in this open source project are volunteers trying to help others and creating a better DNN Platform for all.
Thank you for your continued involvement and contributions!