I do a standardization of file names.
Always start with date;
What the file is
elevator mechanical room details 4 levels
hydraulics ventilation mechanical electrical requirements
Here's where you might want to add something for yourself if you want to have the file for long term reference
reference 999 (might equal forever)
reference 2025 (might equal a date when the file is no longer of significance)
So you have a long file name, which is loaded with keywords for an easy future search
2012-11-08 elevator mechanical room details 4 levels hydraulics ventilation mechanical electrical requirements XYZ engineering 04-12 reference 999 Bill Smith.doc
You could also place the file in multiple locations. One copy for current projects, one in a reference folder
so a future file seach might be "reference elevator hydraulics"
I always use long detailed file names. Where it really helps, is if you are in a company which shares a main frame, and many people are accessing files.
If you name the file "elevator" what does that tell anyone?
Typically when I receive outside files they look like this;
A-205 150712 rev 6 110812.pdf
That doesn't really tell anyone anything, unless you refer to the original email
Disk space is plenty, so I save everything