finding who accesed excel

[Sean]

Hi I am the help desk of a small network, i preform a
nightly backup of everything but yesterday a major excel
sheet had a lot of changes made and no one is owning up to
it, only ten people have write access to it before i
prform the back up i have been asked to find out who made
these changes (and i want to find out for myself)

any help would be great thanks

Sean

 

[Keith]

Open the document
go to file/properties/statistics
this will show you who last saved it