File Compression Problem

Hello all,
I'm having a strange file compression problem with CS5 on our new Mac Pro. We purchased the Mac Pro to scan and process images, but the JPEGs and GIFs we create from this computer are much larger than they should be when closed (e.g. images that should be compressed to 6KB are reading as 60KB, and the file size is often smaller when opened than closed). Furthermore, anytime we use these image files in other programs (e.g. Filemaker Pro) the inflated file size will carry over. What's even more puzzling is that the same files that are reading as 60KB on our Mac Pro will read correctly as 6KB from a PC. Similarly, if we embed these images -- that were created on the Mac Pro -- into Filemaker from a PC, the image file size is correct. We cannot use the compressed files we create on our Mac Pro because the inflated file size will be passed on to whatever application we use on the Mac Pro (except for Photoshop).
We have been processing images for years on a PC and haven't had any troubles with this. We were thinking for a while that the problem was with the Mac operating system, but after many calls with expert Apple advisers it seems like Photoshop for Mac has to be the issue. We have already tried reformatting and re-indexing the hard drive, and at this point there is nothing else that can be done from Apple's end. The last expert I spoke with at Apple said that it sounds like the way Photoshop for Mac compresses files and how Mac reads file sizes is very different from the way Photoshop for PC compresses files and how Windows reads file sizes. If he was correct, and there is no work-around, we'll have no other choice and will have to return our Mac.
Has anyone else experienced this before? The experts at Apple were thoroughly confused by the problem and so are we.
Thanks,
Jenny

This has nothing to do with compression.
Macintosh saves more metadata, and more previews than Windows - that's one part.
Macintosh shows the size of the file on disk, including wasted space due to the disk block size - that's another part. (look at the byte count, not the size in K or MB).
When you upload the files to a server, or use them in most programs, that extra metadata is lost and the file sizes should be identical.
I can't believe that your advisors spent any time on such a trivial issue...

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