This has got to be one of the most useless messages and dialogs with a dont show again tick box. Opening up an assembly file and make NO changes to the file and close it out and this dialog pops up. First question is WHY did it pop up as I didn't make any changes to the file. I also am not wanting to replace any files or components within the file. Next is why when I pick on the DONT SHOW AGAIN box to turn that on, it continues to pop up until it goes thru every file in the sub assembly. Thankfull I don't have a 2000 file subassembly to try and close as it would take me the whole day to close out a file that was never changed. Even if I did make changes to the sub assembly this dialog I'm not replacing the component with a new file but changing the existing file and should be no different than editing a part model and making changes to it.