How to solve this mystery?

[wazza129]

if person X makes a spreadsheet on ms excel 2003 and emails person Y who just renames the file name to Y,how can a third person(to whom both X and Y files are available) identify the cheat? and what measures should Y take to avoid the catch?

[Cheeky Charlie]

Hi, welcome, please title your thread according to the forum rules.

Thanks.