I've been going through my error logs for my domain, it's littered with easily explainable things like failed requests for robots.txt and favicon.ico... but I'm also getting a lot of requests for /_vti_bin.

[Thu Oct  2 03:08:18 2003] [error] [client 194.158.***.207] xx unrecognized FrontPage request: /home/virtual/site24/fst/var/www/html/_vti_bin
[Thu Oct  2 03:08:18 2003] [error] [client 194.158.***.207] (2)No such file or directory: cannot stat _vti_pvt: /home/virtual/site24/fst/var/www/html/_vti_bin

Obviously it's got something to do with frontpage extensions, but why is it being requested in the first place? and why is it producing two errors?