Resize Preview (Office docs/PDFs)

In the preview documents (Office) and PDFs are displayed much larger than when displayed in the actual applications.
For example: the fontsize in the preview, they may look like -say- 16pt, whereas in actual Word it is 10pt.

Suggestion
Add a [-][+][100%] button (or slider)

Something like:
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I guess "Display" doesnot refer to preview, so maybe that option should be available in the context menu of the listing (with me, with preview at the bottom, that is the listing at the top)?

Thanks!
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