When accessing pdf files on a sharepoint site, I'm getting a warning saying

"Some files can harm your computer. If the file information loks suspicious or you do not fully trust the source, do not open the file."

Is there a way to switch off the warning?

NOTE: removing the "confirm open after download" check did not help.

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6 Answers

IIRC, you may need to modify the Security Settings in IE for the specific zone that the site is in where you're downloading the PDF (I'm assuming Local Intranet Zone for Sharepoint). Tools->Internet Options->Security tab->Select zone->Custom level, and then scroll down to "ActiveX controls and plug-ins," and you will have to Enable or Disable some of the prompting/downloading items.

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+1; always check the zone first and foremost. Check what version of IE your clients are using too, as the security model has changed a bit recently. – mh. Aug 26 '09 at 18:03
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This is a client side (Internet Explorer/Windows) problem more than a SharePoint problem. On the client, if you do the following:

  1. Go into Windows Explorer
  2. Select "File Types"
  3. Find the PDF file type
  4. Click the Advanced Button
  5. Uncheck "confirm open after download"
  6. Click OK on the screens
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Thanks, I tried that but the problem remains... – Paolo Tedesco Aug 26 '09 at 16:26
This solved the problem for me. – Jim Feb 1 '10 at 16:35
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up vote 2 down vote accepted

Thank you all for your help; I've found out that the problem was actually due to browser incompatibility with IE8 - must install SharePoin SP2 for IE8 to be correctly supported...

Check this technet link: Plan browser support (Office SharePoint Server).

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If you have Adobe Reader installed, opened PDFs ignore the Windows settings that MattB mentions. This is because Adobe install an ActiveX control into Internet Explorer that changes the open behaviour.

You need to check the preferences of Adobe Reader to see if the setting can be disabled.

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This didn't help as well... thanks anyway. – Paolo Tedesco Aug 26 '09 at 16:48
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I know this question is solved, but an alternative way of eliminating this warning for IE7 was adding the SharePoint site as a trusted site.

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One more Sharepoint 2010 fix which worked for me is:

go to Central Admin >> Manage Sites >> select your site and click it to highlight it.

Then Select "General Settings" from ribbon.

in section "Browser File Handling" select "Permissive" instead of "Strict"

Done

Regards, Moazzam

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