It is recommended that for all Web Applications, you keep the default Browser File Handling setting вЂ“ Strict. This can also be replaced for other MIME types.ДЇunction Add-SPWebApplicationMimeType $webappurl = Read-Host 'Enter Web Application URL' Add-SPWebApplicationMimeType $webappurl 'application/x-shockwave-flash' Summary ItвЂ™s a function that will add a MIME type to a WebApplication. To set handle specific MIME types in SharePoint, you can use the script below. However donвЂ™t do this! The best option is not available through the web interface. Go to Central Administration > Manage Web Applications вЂ“> вЂ“> click General Settings in the Ribbon вЂ“> Scroll down in the General Settings window to see Browser File Handling. The only one you can manage through the web interface is the Web Application level Browser File Handling property. In other words, no matter what the type of content, if it lives within SharePoint, the file will open in your browser. вЂњPermissiveвЂќ specifies that the HTML and other content types which might contain script are allowed to be displayed directly in the browser.вЂњStrictвЂќ specifies the MIME types which are not listed in a Web ApplicationвЂ™s AllowedInlineDownloadedMimeTypes property (more on this in a bit) are forced to be downloaded.There are two options for Browser File Handling вЂ“ вЂњStrictвЂќ and вЂњPermissiveвЂќ.

This header works in conjunction with Internet Explorer (version 8 or higher) to prevent potential security risks when accessing files online and will stop files from being directly opened.

When a user requests a file within SharePoint, the web server (IIS) will respond including the вЂњX-Download-Options: noopenвЂќ HTTP Response Header if Browser File Handling is set to Strict and the file (MIME) type accessed is not on the Web Applications trusted file (MIME) type list. Introduced into SharePoint 2010 as a security feature and the same applies to SharePoint 2013. SharePoint 28 February, 2013 Enable Browser File Handling for Flash with Powershell

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