Commented Issue: Exception of type 'System.OutOfMemoryException' was thrown. [8056]

I am getting this when I do " workbook.SaveAs(filename) ". Is there anyway I can fix this?
 
Thanks
Comments: I looked at issue #8056 and compiling 64 bit helped it get farther....it actually writes out a 53MB file...but hangs with 6GB useage (0 CPU cycles). I'll reply to that other issue as it is more relevant.