Greg ,
   I believe the RS274-X format has resolved a lot of problems for vendors
and clients.  In a previous life, I managed a CAM and CAD department and
fought these battles.

   I would however reccomend you get a Gerber viewer to do a quick review
of the gerber.  I use ECAM myself to check gerber files before committing
to fabrication.  I say this because not software vendors implement-generate
the code the same.  I have had very few inquiries about files, if I do a
quick review of the files first.  With the Ecam program I also send along a
report of apertures used in a file.  

  There are a number of vendors now offering viewers as freeware or shareware.

I hope this helps a little.....

At 10:08 AM 10/31/96 -0400, Greg Bartlett wrote:
>                      Subject:                              Time:  9:04 AM
>  OFFICE MEMO         DES: Gerber formats?                  Date:  10/31/96
>
>Our CAD suppliers currently provide us with Gerber files in RS274-D
format, but several of our PWB suppliers have asked us to consider getting
files in RS274-X format to take advantage of the embedded aperture list.  
>
>Has anyone seen any problems or difficulties with the newer RS274-X format
which we should be aware of?
>
>Thanks,
>Greg Bartlett
>Mercury Computer Systems
>Chelmsford, MA
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>
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