I downloaded Mr. Expense from Nokia Ovi Store and accidentally lost it. How can I recover that?
Recovering your lost application that you purchased from Nokia App Store is easy. Upgrade your Nokia Store client in phone and login using same details by which you purchased copy of Mr. Recorder. Now navigate to Mr. Expense and click 'Downoad'.
For more info have a look at Nokia Ovi Blog

Why I am not able to export the expenses?
Make sure you have selected correct encoding in export settings and there must be no '\' in your account name.