After reading this thread I felt the urge to respond. The PHOTOPLOT OUTLINE was used years ago to restrict the output file to a certain length and width. I think this was used by people that use to put formats on their artworks rather than just a title block. I think most, if not all fabricators read the gerbers into their CAM system where they can check and manipulate anything that they need to. Then, they will either go directly into the photoplotter or generate their own artworks. So 99.9% of the time it is not needed. If it is there, the system will reduce the extents of the gerber data to just that window. If it is not there, it will use the Film Size Limits specified in the General Parameters section of the Artwork Control Form which I think is 24 x 16.
Next, I think just about everyone who is fabing boards these days can read 274x format at a bare minimum. I would not even mess with the old 275 format. Even better, if you are using CAM350,ADIVA, or Valor to check your artworks, I would be using ODB++ or IPC-2581 if you can. We have been using ODB++ for over 3 years without any issue and it puts eveything into ONE file. We even include our Fab Drawing, Board Outlines, Panel Outlines, and anything else we think the fabricator might need. We leave the board outline and other things like dimension lines and text on the fab dwg at 0 line width and it still transfers into ODB++. Heck, even the free ViewMate gerber viewer can read ODB++ data. Time to get out of the Dark Ages boys and girls. Just MHO.......;-) I feel much better now thankyou.