Ways around 2GB/4GB File Limit?

I've seen references to this in previous postings, but no clear answer.
Is there anyway around 2GB/4GB file limits?

I've been relatively happy with the Roku's basic ability to play ATSC 
streams off of our Samba
file server. Unfortunately, an hour long episode of 1080i ATSC 
programming comes in at ~8GB.
Hence the 2GB/4GB file limit makes most of the ATSC programming we're 
capturing un-watchable in practice.

Breaking the file up in multiple pieces is  a work around, however, 
this breaks other
systems (e.g., mythtv's backend) and viewers as well as complicates 
back-end storage and management.
I'd rather apply any effort to making the Roku do the right thing.

I'm trying to understand if this is an issue with the Roku's version of 
Linux (I'm running the standard Roku-1.5.18, Linux 2.4.18) or just 
their version of Samba and NFS. (I've had no problems playing files via 
laptops (MacOSX)/pc's(WinXP) with VLC over both samba and NFS)

Samba:
	I think it may be a 4GB file limit size (files >2GB seem OK, files < 
4GB don't really work.)

	When I trying 'ls' files, I just get large negative or incorrect 
numbers.
	All files are listed properly under CinemaSix/MpegPSPlay
	Files will play for about the first ~4GB and then just stop. The unit 
doesn't lock up, it just
	pauses on the that frame of the file. (These files play fine via VLC 
on MacOSX/WinXP.)

NFS:
	when trying to 'ls' files larger than 2GB I get this error:
	<file> Value too large for defined data type
	(Interesting to note that these same files will 'ls' properly under 
samba if size is >2GB and <4GB.)

	These files don't even show up under CinemaSix/MpegPSPlay.
	If I 'dd' off a couple of megabytes, these files play just fine.

Has anyone had any luck getting around these limitations?
Is this a known issue?


Thanks,

Taylor

P.S.

I couldn't help but notice Rokulabs seems to be located in Palo Alto 
(CA). I presume the Roku folks already have large example files to 
test, but if not, I'd be happy to bring a couple over via a firewire 
drive.