Well actually, Win10 font rendering is broken, i.e. 1 and l look completely the same on Courier New on Win10, but not on Win7 ... there are years old bug reports (it broke in some feature update), but of course those have been ignored.
To add to what aap mentioned, it also made it relatively easy to compile re3 and reVC with the original IDE it was written in - CodeWarrior 7. Some things accidentally made it in, like sized enums, but overall no major surgery required, or rather, far less than I expected.