Hi Senthil,
Use this URL:
XMII/Illuminator?Service=FileSystemBrowser&Mode=FileList&Folder=<projectname/foldername>&mask=Query&Content-Type=text/xml
If you don't provide the mask as Query then it would return all the files existing in the folder.
Other possible options for mask are :Query, Display, Object
Regards,
Rohit Negi.