This stream does not support seek operations

I have followed the demo video on YouTube and got the DocumentViewerControl to run in my WebForms app.

I have tried a few different file types and found the following

1. PDF or DOCX located on my PC both work

2. PDF located on a different machine accessed via https://myServer/xxxx/YYYY.pdf works ok

3. DOCX located on the same server accessed via https://myServer/xxxx/YYYY.docx fails and reports 'This stream does not support seek operations'

Is there any solution for this?

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