when i download a file it shows "tmp/Stock_Reconciliation_Template-7.csv could not be opened, because the associated helper application does not exist. Change the association in your preferences."

[wazz]

Binary package hint: firefox-3.5

when i try to open a file from a site it gives the following error:
"tmp/Stock_Reconciliation_Template-7.csv could not be opened, because the associated helper application does not exist. Change the association in your preferences."

ProblemType: Bug
Architecture: i386
Date: Tue Feb 2 15:43:06 2010
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
Package: firefox-3.5 3.5.7+nobinonly-0ubuntu0.9.10.1
ProcEnviron:
 LANG=en_IN
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-18.55-generic
SourcePackage: firefox-3.5
Uname: Linux 2.6.31-18-generic i686