I don't know what a .frn file is, perhaps you are using a Mac? I don't think there is any way to fix a network render, my friend. But, you could try to do it the same way you would normally, by opening the appropriate AX file with Bryce 5... I know it works on XP, but I don't know much about OSX. Was it a single still that was taking you days?!?! Perhaps some optimization is in order...? Show us your scene and it might help...?