Here is the way I got it to werk, NOW THIS IS NOT FOR EVERYONE SO TRY THIS AT YOUR OWN RISK!!
I replaced in Vlite's root folder wimgapi.dll with win 7's wimgapi.dll from WAIK tools ( WAIK tools folder -> x86 folder\wimgapi.dll )( have to download the iso from MS ) and install WAIK to get these files .
You will need to uninstall the Vista wimfltr that is loaded on your PC ( if you have ran vlite after installing it ) as the files from WAIK 7 are not the same , not sure how to do it manually as I have the InstWimFltr.exe
by JFK from a winbuilder project that I use, that will uninstall the wimfltr of Vista's ( yep fixed that winbuilder project too with WAIK 7 Files )
Also a reboot when uninstalling these files wont hurt, after removal of the wimfltr of Vista's just to clear any memory that might be latched onto these files.
From WAIK, I also copied in the x86 and (amd64) wimmount.sys replacing wimfltr.sys by renaming wimmount.sys to wimfltr.sys respectfully in both x86 and x64 folders so yes delete wimfltr.sys in both folders first then copy in the win 7 files
I didnt change the wimfltr.inf at all, I left it as vlite installed it, I just replaced the wimfltr.sys in Vlite's folder with wimmount.sys from WAIK and renaming it to wimfltr.. easy peasy
what you end up with is Vlite using win 7 dll files, it werkd for me, but I got a error or 2 at first, then they went away, I made 4 builds back to back with the SP1 x64 and everything was fine and the iso installs fine too.
NOTE: even uninstalling Vlite from Add | Remove Programs DOES NOT UNINSTALL the Vista wimfltr!
NOTE 2: After running Vlite on a win 7 moddin win 7 have you ever encountered that DISM fails( Pre SP1 iso files that is )??
NOTE 3: I got a few small errors after doing the above from Vlite, but after a few errors passed all was good hence the TRY IT AT YOUR OWN RISK.
Anyways maybe that is enough for some more knowledgeable person to figure out a better werk around than what I have done.
Vlite does the job I want quicker than RTLite, RTLite is way to slow and seems like it wants to just freeze up the whole time I run it,.. a scalpel over a hammer any day lol , this is my werk around for that