httpd.log-entries

Hi folks, sorry if this was already discussed. In my httpd.error_log I can find hundreds of entries which show that I get permanently scanned for "root.exe" and "cmd.exe". Okay cmd.exe is of course the command interpreter of Windows-Systems. This interpreter is being searched in lots of locations (winnt/system32 and different other locations; of course without affort as I'm runnign a linux-System). But I've never heard of root.exe. What is this ? root sounds familiar *sigh* but I've never heard of a root.EXE... As this scans also take place on my Dial-In-machine, there seems to be a scanprogram which scans the range(s). Does anybody know of such a scanprogram ? Is there any danger for my linux-system ? thx. Stephan