Helvetica 90ms-RKSJ-H infecting our Illustrator files

Question

I am working in CS3 on OS 10.4.11, but we also use CS2 on some of our Macs with 10.3.9.  We do not use Font Utility programs. We mantain an organized font library and only load our licensed Postscript versions of fonts into our main Library Fonts folder.
We are receiving files with Helvetica 90ms-RKSJ-H where it should be Helvetica Medium. Such files appear to have Helvetica 90ms-RKSJ-H in the Illustrator font menu in addition to Helvetica even though the font does not exist in our library.  The only way we have found to rid our files of this font is to replace it with anything but Helvetica Medium, save, quit Illustrator, reopen and then replace with the true Postscript version of Helvetica Medium. If we open a file with the Helvetica 90ms-RKSJ-H and then open an accurate file it will look like it has the wrong Helvetica. If we save, that file while it looks wrong it will become wrong.
Another good description of this problem can be found here: http://adobe.groupbrowser.com/archive/t-171734.html but it is from 2007.
I want to know if there is a better solution from what we are doing.  We either need to instruct our outside vendors on the best solution to rid their files of this issue before it gets to us or correct mass quatities of Illustrator files ourselves.
Please let me know what other info that would be helpful to this discussion. Thanks for any insight and info that can be given!

Answer 1

Glad to see there is a Helvetica RKS-J 90ms thread now. I looked into this a little maybe a year ago and had come across a few threads on other cmap issues like this but not much specifically on RKS-J 90ms.
I believe RKS-J 90ms is a Japanese character map (cmap) that is being referenced rather than it being font in itself. There two places it may be--either  in your Adobe or Acrobat folder. It may be under Adobe>Acrobat>Resources>CMap in Windows. Where I work we review localized art files many of which are Japanese. This problem spreads if we open any untainted files while in a session referencing Helvetica RKS-J 90ms. The sheer quantity of files we go through and number of languages we boot into has made starting a fresh session with Illustrator for each new illustration job or document review impossible. I'm sometimes booted into one language for an entire day, but opening other language localized files in Illustrator (can be done in Illustrator, though not FrameMaker hence the booting into Japanese, etc.). Maybe this is a bad idea.
How do others in this thread come across the Japanese cmap? Do you work with Japanese language files? Someone here suggested we use VMWare to boot into Japanese so that we don't keep spreading the infection.
This may be off topic, but we also save down a lot (my group works in CS4). Its usually to CS(1) which causes problems as CS2 had many new tools/techniques (legacy type problems are pre CS1 though). I've suggested we don't save down below CS2 unless completely necessary to exchange a file. Saving down may not be related, but in threads on similar cmap referencing problems, some people claimed to reduce the problems or get rid of them by not saving down. I don't believe this is a solution, but there are so many other problems that can come with saving down to too low a common denominator.
I really hope this thread continues and we can find a permanent solution.
Thanks