I wanted to also mention that the issue of permissions also comes into play when using /rename not just /write.
With the change to having mIRC default to have the download folder beneath Application Data, renaming (moving) a downloaded file to another folder on the same drive letter causes the file to keep the permissions of the source folder, regardless of the destination folder's permissions. When renaming to a different drive letter, the destination file is given permissions from the destination folder.
I don't think /rename should be changed to be doing a copy+delete, as that can add extra work for the system. Either a new switch to make /rename do a copy+delete, or a mention of this issue in the help file section for /rename should probably be sufficient.
