Change the extension of Uploaded Document

[Siddiqali]

Hi All,
        I am using Rad upload control and uploading the document in SharePoint Document Library.After uploading the document I want to change it's extension to .txt file can any one help me how can I change the extension after  the uploading document

[Cat Cheshire]

Try looping through the SPFiles in the DocumentLibrary and changing the SPFile Name.