Guess I've not been paying attention... what type of problems have you seen with sendfile (TransmitFile) on Win32? We do have a performance problem (will leave out details unless your interested) but I was not aware of corruption problems...
The example which, I guess, was the impetus for this thread: http://issues.apache.org/bugzilla/show_bug.cgi?id=34037
I don't have any way of quantifying how frequent this is, but it certainly shows up on a regular basis.
Joshua.
