Traveller Navigator, by Planet 3 Software, was a set of five "enhanced"
Windows 3.1 Help Files, each of which included pre-Rebellion and New Era
data for a complete sector, including clickable subsector maps, general
library data, and ship specifications. They only worked on systems that
would support 16-bit Windows DLLs, which meant that only 32-bit Windows XP
or earlier was supported (64-bit Windows XP supposedly supported 16-bit
software, but in practice, getting it to run involved a 32-bit 'Virtual
Machine'). Sectors released were Spinward Marches, Deneb, Reft, Diaspora
and Old Expanses.

These are available from Freelance Traveller (linked from
https://www.freelancetraveller.com/infocenter/swlist/winprogs.html); as
Windows 3.1 reportedly runs on DOSBox, it is at least conceivable that one could get them working.