Centralized master bib file with bibunits

Question

I saw here: https://tex.stackexchange.com/a/38290/69378 that

You can reference central-bibliography.bib at an absolute or relative (preferred) location from within the \bibliography command:

\bibliography{../references/central-bibliography}

I haven't been able to duplicate this behavior using bibunits and \defaultbibliography{}. Is this impossible? Or have I have I hopefully missed something superficial?

The reason I am trying to implement a solution like this, is I am sharing a common bib and bst file (among many others; which are all under heavy development) with my collaborators, but to ensure everyone is working from the same up-to-date file, I have to put the path references in the tex code, because everyone is using a different method to compile the code. I was hoping I could add a path to \graphicspath{} but they don't seem to communicate. Unfortunately as well, a back trace /../ is out of the question as everybody's path to the dropbox will be different.

\documentclass{article}
\usepackage{grffile}
\usepackage[numbers,square,comma,sort&compress]{natbib}
\usepackage{bibunits} 

\defaultbibliography{F:/Work/Dropbox/__.Bib Files To Merge/CombinedBibFile}% tried with and without quotes
\defaultbibliographystyle{F:/Work/Dropbox/__.Bib Files To Merge/IEEEtranNcustom}% removes URL additions 

\begin{document}
\renewcommand{\bibsection}{\section{\bibname}\markboth{\leftmark}{\bibname}}
\begin{bibunit}
Text with citation \cite{BIBTEX_KEY_HERE).

\putbib
\end{bibunit}
\end{document}

Answer 1

I welcome any more robust answers, but I have solved this issue by removing spaces from the file path.

I originally didn't think that was going to be successful, because I had tried (with no success)

1. adding quotation marks around the path
2. tried out the recommendation here: https://tex.stackexchange.com/a/27537/69378 but using \detokenize{} and replacing spaces with ~.