export failure for read only file error isnt clear

Description

Using the latest autobuild, exporting to an OS that is already open (in acrobat reader) gives an error message that, instead of just saying the file is read only, refers you to the log where it indicates that the file cannot be accessed.

The initial error message could just make it clearer as this is probably a typical issue.

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Reporter

Dave Griffin

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Priority

Minor
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