Restrict Certain file types in Sharepoint 2010

In SharePoint 2010, by default, many file types are blocked, including file types that are treated as executable by Internet Explorer 7.

However, if you want to block some other extensions follow the Steps below:

1. Goto Central Administration and click Security.

2. On the Security page, in the General Security section, click Define blocked file types.

3. On the Blocked File Types page, Select the desired Web Application.

4. To block a file type, scroll to the bottom of the Type each file extension on a separate line text box and type the file extension you want to block and then click OK.

To Unblock :

just Select the File type and Delete it.

To this Programmatically see my post @ Programmatically restrict file types in sharepoint 2010


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