Thanks! That is some help.
Here is a link to some information that I found interesting. While it pertains to Inkscape I presume the gdbus.exe is the same as in Darktable. The referenced information implies that gdbus.exe is intended for use from a command line. Possibly this would mean that its’ absence is NOT relevant unless such an operation were desired when using Darktable. At present I don’t know what that might be but it looks like, for now, this is NOT something to be very concerned about.