DVI resolution question

Hopefully some kind soul will take pity on me and help me gain some insight on my situation... I recently bought a Samsung 2343BWX LCD monitor to replace a Sony E540 21" CRT monitor that quit a couple of weeks ago. The Samsung monitor is a 23" LCD with a native resolution of 2048 x 1152. My current video card is an MSI NX6600GT TD128E PCI-E card *yeah, I know its "old") that has one DVI and one VGA connector. The video card is capable of a max resolution of 2048 x 1536. I am able to get the 2048 x 1152 resolution when attaching the monitor to the video card's VGA connector. However, when I attach the DVI connector, the best resolution Windows XP, SP3 offers in the Display Properties, Settings tab is 1680 x 1050. I've been told by MSI tech support, that "...the DVI-D 1.0 port support maximum resolution is 1920*1080/60HZ or 1600*1200/60HZ...". I take their reply to mean that DVI-D 1.0 port support is a standard, and applies to all video cards that implemented that standard. So, while I can't get the full 2048 x 1152 resolution through the DVI port, I should be able to get 1920 x 1080. So here are my questions:

1. Is the DVI 1.0 port standard still the standard on the most recent cards, or do more recent cards now support a higher DVI port standard that would provide the 2048 x 1152 support via the DVI port?
2. Is the fact that Windows XP doesn't offer a 1920 x 1080, or resolution higher than 1650 x 1080 a limitation of the support provided by the Samsung monitor through it's DVI connection or is the video card making this limitation in some manner? Remember, I can get the 2048 x 1152 resolution through the VGA port.
3. Depending on the answers to the q's above, is there anything I can do to get Windows to offer and support the 1920 x 1080 resolution? I'm using the vendor supplied monitor driver file (.icm) for the monitor.

Thanks in advance for your help.

Update: Through the use of software supplied with the video card (NVIDIA Control Panel), and some experimentation, it appears that the answers to question 2 and 3 are that the monitor cannot correctly display the 1920 x 1080 resolution. It does not appear to be a problem with the video card. I believe Windows doesn't offer resolutions higher than 1680 x 1050 because the monitor's plug n play feature doesn't publish (?) anything above that as a supported resolution when using the DVI port (can't display it properly on the 16:9 ratio monitor). So, while I was able to get Windows to list the 1920 x 1080 resolution in the Display, Settings tab by using the NVIDIA Control Panel to force the listing, the monitor really can't display it properly.

Can anyone comment on question 1?

Update 2: I know this is really a very late update, but thought I'd finish this off. Might be useful to someone. I never did figure out what the real problem or problems were. I eventually gave up and returned the monitor to Costco. Bought an ASUS VH242H from newegg and it worked perfectly at its native resolution of 1920 x 1080 via the DVI port on the MSI NX6600GT video card. Go figure...