My personal opinion is that it's an inside joke. The first incarnation of the Windows 32 bit operating system was supposed to offer all kinds of great things, including a new file system. It never panned out, but many of the ideas for this project eventually found it's way into Windows 2000.
This project was code-named Cairo.
Not long ago, Microsoft released Windows XP. In the Greek alphabet, "X" is pronounced "Chi" (kai), and "P" is pronounced "Rho" (ro). Put the two together, and "XP" is pronounced Chi-Rho, or kai-ro. Cairo.
Microsoft employees are uber-geeks. I can't believe this is coincidence.
Remember the old TV ad for Microsoft's Internet Explorer, which used the musical theme of the "Confutatis Maledictis" from Mozart's Requiem?
The screen says "Where do you want to go today?" while the chorus sings Confutatis maledictis, flammis acribus addictis. This translates to The damned and accursed are convicted to the flames of hell. Another coincidence? Or another Microsoft Geek having a little fun?