Thread:Project:Support desk/Syntax for showing Images on the Wiki

We are in the process of upgrading our MediaWiki software from version 1.15.3 to 1.20.5 and PHP version from 5.1.6 to 5.3.3. In the old MediaWiki version, the following syntax for showing images worked: i.e. the Wiki page displayed the picture. This syntax does not seem to work in the new MediaWiki version - the picture is not displayed. All that is shown is a link which does not link to anywhere. However if you change the syntax to (i.e. change "File:" to "Image:") in the new MediaWiki, it works.

Can someone explain why the File: tag does not work in the new MediaWiki version?