DosLFN is another.
DOSLFN is a program originally by Henrik Haftmann to provide the long filename (LFN) API in plain DOS (without Windows).
Beside the lack of USB compatibilty, the only one problem Windows 3.1 has is
............ Lack of security,updates,plug and play,memory management,user friendlyness.........

Yes I realise there are a small hardcore who still use it and there are several active newgroups but personally Id say as a valid modern operating system its twilight years are well and truly gone by.No slight intended

BTW for those still using DOS some limited USB capture may be possible see Bootdisk.com for more info.