1998.04.07 15:40 "Re: libtiff isn't closing all of the file handles on NT ?", by Rex Jolliff
I saw this same behavior under VMS and traced it down to the file mapping code also. I noticed that it was allocating a channel and then not mapping the file correctly, so it gave up on the map, but it did not deallocate the channel after the mapping error. Perhaps somthing similar is happening in the NT code?