Types of files that cannot be added to a list or library

Blocked file types for SharePoint Server 2016

There are certain types of files that you can't upload to a list or a library on SharePoint Server 2016. By default, SharePoint blocks these file types. For example, if .asp is on the list of blocked file extensions, a file called "newpage.asp" is blocked.

Variations of a file extension are also blocked. The following list shows different ways of representing the same file, all of which are blocked if the .hta extension is on the list of blocked file extensions.

• filename.hta

• filename.hta.

• filename.hta.{3050F4D8-98B5-11CF-BB82-00AA00BDCE0B}

• filename.hta::$DATA

These are the default blocked file types for new SharePoint Server 2016 deployments.

To learn how to change or add file see Add or remove file types.

Filenames that include braces (for example, filename.{doc}) are blocked automatically.

Add or remove blocked files to SharePoint Server 2016

If you have farm administrator permissions, you can add or remove blocked file types.

1. Open SharePoint Central Administration.

2. Click Security, and then click Define blocked file types.

   

3. To change the web application, click the link next to Web Application: and then click Change Web Application.

   

   In the Select Web Application dialog, click an app.

   

4. On the Blocked File Types page, do one of the following:

   To add a file to block, type a file extension (with the period), one per line.

   To stop blocking a file, select the file extension and press the Del key.

   

   If you delete the wrong file by accident, press CTRL + Z to undo.

   Note: You do not have to type a file name extension in the list in alphabetical order. The next time that you open the list, the file name extension you added will be correctly sorted in alphabetical order.

5. Click OK.

Blocked file types for SharePoint Foundation and SharePoint Server 2013 and SharePoint Server 2010

For on-premises deployments of SharePoint Foundation or SharePoint Server 2013 and SharePoint Server 2010, a server administrator can add or remove file types from the list of blocked file types. For more information about how to work with blocked file types for SharePoint Server sites, see one of the following articles, depending on the version of SharePoint you have:

• Manage blocked file types in SharePoint Server 2013

• Manage blocked file types (SharePoint Server 2010)

• Manage blocked file types (SharePoint Foundation 2010)

The following file types are blocked by default in on-premises deployments of SharePoint.

Filenames that include braces (for example, filename.{doc}) are blocked automatically.

Add or remove blocked files to SharePoint Server 2013 and SharePoint Server 2010

If you have farm administrator permissions, you can add or remove blocked file types.

1. Open SharePoint Central Administration.

2. Click Security, and then click Define blocked file types.

   

3. To change the web application, click the link next to Web Application: and then click Change Web Application.

   

   In the Select Web Application dialog, click an app.

   

4. On the Blocked File Types page do one of the following:

   To add a file to block, type a file extension (with the period), one per line.

   To stop blocking a file, select the file extension and press the Del key.

   

   If you delete the wrong file by accident, press CTRL + Z to undo.

   Note: You do not have to type a file name extension in the list in alphabetical order. The next time that you open the list, the file name extension you added will be correctly sorted in alphabetical order.

5. Click OK.