Michael, As Ruth said after RootsIII was RootsIV. RootsIV was still a DOS program but was able to handle bigger files and didn't have to have the memory RootsIII needed as it used the HD to store the data instead of working in RAM.
But the database that was generated from importing the RootsIII data is almost the same in UFT as in RootsIV.
An attemp was made to go to Windows with Visual Roots, same database, but was had some features of RootsIV locked out. VR was sold and became Family Gathering still with features locked out. RootsV was the first Win program which was then sold and became UFT. UFT went thru several owners and then put to sleep by the makers of FTM. (buy your comp and close the doors on them). The database used today in UFT could still be opened in RootsIV I would guess but have not tried it for awhile.
Is there work in changing from RootsIII to UFT. Depends if the user strayed from suggested data input. Many put the site before the place name. Church name or cemetery name before the city ect. The site name now goes in the Detail field. And the sources are more detailed.
As Ruth suggested maybe the better way is to get RootsIII going on the new computer. In her method I didn't see anything about memory management. So I think there is more to getting it running. Been to long for me and her user group took all the info from the VA users.