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How can I control which file types are shown as thumbnails and which as icons? I do think that showing these tiny little thumbnails for things like text file or spreadsheet is utterly stupid. You can't see a thing on that, and you have to guess what file type you are looking at.

I know that I can set explorer to show only icons (Always show icons, never thumbnails), but that's not the solution because then I can't see jpeg thumbnails. I would like to show thumbnails only for image files and disable them for files like pdf, xps, docx, xlsx and similar. Is there a tool for that?

Setting this on "by folder" basis (Optimize this folder for) isn't solution either.

Update: I've found this question: How do I disable (video) thumbnails in Windows 7? that points to this tool ShellExView. It looks like this might be the solution I'm looking for, but I'm not sure how to use it. For example it does not show anything from Adobe - does that mean that thumbnails for PDF files are not generated by the shell extension?

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AFAIK it's all or nothing, unless there's some 3rd party app to do this (but I haven't seen one yet). – Karan Nov 22 '12 at 0:55

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