CAD vendors are keen to extract more $$$ from your IT budget, and one approach is to promise to organize all your design files with their software, call it EDM, PLM, or ETC.
I'm reading a tutorial series by George Mann at the Digital Photography & Macintosh Computers site. In talking about storing digital photographs, he writes:
Step 3: Manually set up a folder for your image files on your computer. I suggest using a very simple (and admittedly boring) system based on the calendar, roman numerals and alphabet. For example: year / month / date / shoot number. This may not be as sexy as an automated database system but it will save you a lot of grief when the database decides to go south for the winter.
CAD vendors like to express their shock, horror, and amazement at customers who use Windows Explorer as their "EDM" [electronic data management] system. But if it works, why not? It's not like the proprietary EDM/PLM software will be around forever -- unlike, say, our digital photographs and digital drawing files.