A friend of mine has an excel workbook whose contents are sensetive and
confidential (just business intel, nothing risque). He wants me to show him
how to provide 'password protection" for the file. Other than using a 3rd
party tool (PGP?),
it there a standard windows facility for limiting access to a file on one's
own machine? I'm assuming he's worried about
a. someone stealing his laptop
b. someone making an unauthorized copy of his file (Industrial espionage?)
c. someone at work being able to access the file via the intranet.

Any suggestions?