AxiFFF.tmp files are created when bryce is closed without saving properly. Sometimes you can rename them AxiFFF.BR5 and they will open but usually they get about half open and crash on you. If you just turn off the computer you create one of these every time. They can rapidly use up all your drive space. If you have these, rename them to .BR5. Try to open them by clicking on the file and letting it open. If bryce fails to open it delete it. You need to be fair hacker to repair this kind of damaged file. The other advice I have is get a big hard drive and save your work after major changes and every day. My stargate9 mesh is called that because I have 9 backup versions saved starting with plain stargate on day one and ending with stargate9 on the ninth day of modeling. I did screw up on stargate7. I opened stargate4 to get the parts I needed before I messed them up and pasted them into stargate8. Because I had the early backup I was able to do only one more day of work rather than redo five days. Save early, save often, and save multiple versions. It will keep you from getting stuck out on a limb after major investments in time and effort.