{{tag>Index Function Function_List Files}}
====== FILE_EXTENSION ====== 
===== Description =====  
Returns the extension of the specified file or document
===== Parameters =====  
An expression returning a string identifying a file or directory name or an attribute of the Document type
===== Example =====  
<code aim>DISPLAY MESSAGE ('File extension is ' + FILE_EXTENSION('c:/myfile.txt')) </code>