Question: how to view source code in a .maple file (workbook format)?

I'd like to view the Maple source code in .maple file. I am not able to find how to do this.

I tried commands in 136697-Can-One-Get-The-Source-Code-Back-From

which applies to .mla using the march command. But it did not work for .maple. It gives an error when trying it on .maple file.

I can open the .maple file in the Maple user interface OK using File->Open

but other than documentation, I see no Maple code.

I am looking now at Physics updates file, which can be downloaded as .maple file from 

https://maple.cloud/app/5137472255164416

Since most Maple code can be viewed, I assume one can also view the source code in the above.

Any idea how to do this?

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