On a Sharepoint2013 site, there are some excel files uploaded to the list attachments and document library. When user clicks the excel file, it prompts an error:

This workbook cannot be opened because it is not stored in a trusted location. To Create a trusted location, contact your system administrator.

I have checked the Trusted Location settings and the default is for the whole ShaprePoint server.

Opening Word docs will download the word document.

1 Answer 1


One workaround for this issue is to force Excel documents to be opened in a Client application.

Try deactivating and activating "Open documents in Client Applications by Default" site collection feature for a try.

You could also run the following PowerShell to set SPList.DefaultItemOpen property value to open list items attachments in client application.

$web = get-spweb http://<site>
$list = $web.Lists["list name"]
$list.DefaultItemOpen = [Microsoft.SharePoint.DefaultItemOpen]::PreferClient

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