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Oddly I have not yet seen that but then today am not using previewer and I usually remove the MOTW (Mark of the Web) by right click files I think!! are safe to use in SumatraPDF as it does not run JS embedded in the files. Currently my download folder that might be affected is empty! and checking an adjoining folder I see Acrobat previewer is master !! But having downloaded a known safe sampler it does say it is not to be trusted so is not SumatraPDF or Acrobat simply Windows ! |
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one of the better tools to remove those Microsoft trojans is "streams" by Microsoft sys internals https://learn.microsoft.com/en-us/sysinternals/downloads/streams of course you need to remove its ADS zone identifier first :-) and then it removes all those ADS worms from the target locations co-pilot (s)he say
WORM-style behavior: Once a file is tagged, it’s locked down. You can’t easily override it without manual unblock or NTFS stream manipulation. |
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Greetings!
This isn't a bug within SumatraPDF itself and I'm not sure if the devs can deal with it, but I'd at least draw attention to the problem. As of the most recent and final update to Windows 10, PDFs and DJVUs downloaded from the internet are regarded as suspect, and so when the file is clicked the preview pane only says "The file you are attempting to preview could harm your computer. If you trust the file and the source you received it from, open it to view its contents.".
In file properties, a new option has appeared: "Security: This file came from another computer and might be blocked to help protect this computer.". If checked, it allows the preview again, but only for the individual file, with the rest of your files staying unpreviewable. (Producing or editing a PDF results in a previewable file.)
According to this blogpost, some programs can circumvent this problem. I tried to test it with PowerToys, it doesn't seem to work at least in my case (same message appearing as with Sumatra), but if at least theoretically possible it means Sumatra might be able to use the same solution to circumvent the overzealous Windows security too.
While the other solutions on the blog do work, it would be great if Sumatra could solve this by itself.
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