Eurogamer reports that Bethesda has said there will "definitely" be no developer tools shipped with the PC version of Fallout 3.
But it remains a possibility for the future, unlike on consoles where there are too many "barriers" to overcome.
"It will definitely not be included on the disk," said Todd Howard in a fan interview on the Bethesda forum. "If and when one is available it will be a free download. I wish I could promise that an editor will be coming and when, but I can't.