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The definition of the 'View Only' permissions level is as follows:

Members of this group can view pages, list items, and documents. If the document has a server-side file handler available, they can only view the document using the server-side file handler.

What is considered to be a server-side file handler in the context of SharePoint? Is this an HTTPHandler? What technology is it based on, how do I write one?

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Server-side file handler is something like Excel Web Services, or HTML Viewer, I thought.

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You've got an explanation here

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Thanks, but that doesn't explain it at all (I came across that post as well during my initial investigation). – Muhimbi Jul 26 '10 at 16:14
While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. – John Chapman Oct 17 '12 at 14:18

I think it mainly refers to ASPX files being executed on the server before returning data rather than downloading the actual ASPX file.

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up vote 0 down vote accepted

This has now been answered (more or less) on the StackOverflow version of this question.

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