In this article we will discuss how we can add or remove blocked file types in SharePoint 2013
By default SharePoint restrict some file types which can not be uploaded or downloaded. There is a huge list you can check here
to know which files have been restricted.
But you can add or remove files types by using SharePoint central administration like below:
First Open SharePoint Central Administration.
Click on Security. Then from the General Security section click on Define blocked file types as shown in the figure below:
On the Blocked File Types page, You can also change the web application for which you want add remove blocked files.
Then in the box you can delete if you want to remove any file type or you can add file types in separate line which you want to restrict as shown in the figure below.
Here we have added extension type of xyz. Means if a user will try to upload file with extension type as xyz then s/he will not able to do that.