Illustrator CS2 Memory Allocation Issue

Question

I have a client who uses illustrator cs2 and whenever anyone uses illustrator to open enough files to cause illustrator.exe to consume 750mb of ram "through task manager" it says "An unknown error has occured"
Now i have tested this on around 6 different computers all with varying specs everyone with at least 2gb of ram and all core2duo or better and the problem is consistant across the board, i have searched through almost every google search possible relating to this issue with no avail, the issue does not persist in photoshop cs2 and you cannot directly allocate more ram to illustrator, i have also made changes to the page file making it up to 3 times as big as max memory. It seems to be some limitation of the memory that can be used by illustrator. Could anyone who has experienced such a problem or has illustrator and can try opening enough files to reach a peak of around 750mb mem use see if they experience the same issue.
The file sizes they are opening are only around 5mb but once opened consume around 300mb of mem. At this stage they dont want to upgrade to cs4 until there is some proof that this is indeed a limitation of cs2.
Any help would be much appreciated.
Cheers

Answer 1

Ok, Just because i have spent so much time researching this and it seems to be a recurring reported issue with abode users. I will attempt to summarise my findings and the resolution we used.
Firstly i would like to say that adobe has the worst call centre i have ever encountered with a 4 hour hold to speak to a SALES person before hanging up this occured between 12pm and 4pm aest on thursday 27/08/2009, I would never recommend calling adobe if your time is worth anything to you, because it is certainly worth nothing to adobe. *breath* I guess that can do this because they are the only feasable graphic solution available in their market segment, seems like microsoft of the graphic design world. Anyway, enough rant.
What i found was that adobe did not support working over a network share and went about fixing this issue a number of years ago, their solution which is more of a work around was to create version cue, So anyone who encounters constantly corrupt files while operating over a network must deploy and use version cue, the current supported version cs4 has numerous issues specifically with the check in and checkout procedure, the only way you can prevent data lose in the event of a windows crash (obviously a common occurance) is to checkin in your data regularly as saving will only keep a copy if adobe drive remains open, this results in numerous versions and kinda makes saving redundant as saving is only temporarily keeps your work for the session.
CS4 is much more stable and i have not encountered any issues with limitations of the ammount of virtual memory assigned i have had around 30 open at one time and no issues, overall a much better and more stable product that cs2, too bad they couldnt implement a better version control system, i am also very iffy about moving this data to another server.
Thanks to all who contributed and the assistance recieved by this community, way more helpful than adobe technical support.