What does FilesTime return?

Does any one know what the number is?
It does not look like Julian date.
Is the formula to get day/month/year etc the same for Win98/winXP/Mac/Linux ?

Print CurrentDir$()+" FileTime  = "+FileTime(CurrentDir$())
DebugStop

This has tricked me for days!

Unix timestamp.

http://blitzwiki.org/index.php/FileTime

Thankyou.