Show me your harddisk, I will tell you who you are

How can some experienced developers be unable to organize their folders on their workStation ?

Like not having a Download folder and downloading everything on the desktop, or being unable to find where is the previous version of the product under development (= not having a place to put ear and war files).

This one question I would ask if I ever conduct a job interview : where do you download your opensource libraries and tools, how do you organize it ?