I need support it is urgent

Hi every one
I need help , i have a application of http://www.projectlaika.org/
i need to store a xls file extension please provide how to do make a
list of steps if possible and i hope to get reply as soon as possible.

filemodel.extension = File.extname("/some/path/myfile.xls") # output
is ".xls"

Do you mean instead that you would like to store an xls file? If so
check out acts_as_attachment, attachment_fu or file_column plugins.