AFAIK, the volume isn't connected when Parallels isn't running. It was running and connected (i.e. I can access the C drive from the Finder) when I entered this in Terminal. Here are the results:
Last login: Tue Feb 11 13:26:35 on ttys000
joshs-mbp:~ joshdillon$ mdls "/Volumes/C/Projects NXT/Current/Reine stemming/EXPORT/ENG/EN Icoon en muziek cd finale versie.docx"
/Volumes/C/Projects NXT/Current/Reine stemming/EXPORT/ENG/EN Icoon en muziek cd finale versie.docx: could not find /Volumes/C/Projects NXT/Current/Reine stemming/EXPORT/ENG/EN Icoon en muziek cd finale versie.docx.
But after doing some more testing, it looks like the Spotlight results are a bit hit and miss. Really sorry about that! It looks like the best solution is just for me to move these two directories to the Mac side so that Alfred has uninterrupted access to them. Apologies again, and many thanks.