BibTex can't find my .bib file, and appears to be looking in the wrong places

Question

I have spent a rather frustrating few hours trying to get TexWorks to work with either or both of BibTex or biber.

I tried running the minimal example

\documentclass[12pt]{article}
\usepackage{natbib}

\begin{document}

\title{BibTeX in action}
\author{Martin J. Osborne}
\date{2008-1-13}

\maketitle

\section{Introduction}
This document illustrates the use of BibTeX\@.  You may want to refer to \cite{ahu61} or \cite{ab94} or \cite{m85}.  Or you may want to cite a specific page in a reference, like this: see \citet[p.~199]{m85}.  Or perhaps you want to cite more than one paper by Maskin: \cite{m85, m99}. Or you want to make a parenthetical reference to one or more articles, in which case the \verb+\citealt+ in the \texttt{te.bst} bibliography style omits the parentheses around the year (\citealt{ahu61}).

\bibliographystyle{plain}

\bibliography{bibl}

\end{document}

with .bib file

@article{ahu61,
   author={Arrow, Kenneth J. and Leonid Hurwicz and Hirofumi Uzawa},
   title={Constraint qualifications in maximization problems},
   journal={Naval Research Logistics Quarterly},
   volume={8},
   year = 1961,
   pages = {175-191}
 }

@book{ab94,
   author = {Charalambos D. Aliprantis and Kim C. Border},
   year = {1994},
   title = {Infinite Dimensional Analysis},
   publisher = {Springer},
   address = {Berlin}
 }

@incollection{m85,
   author={Maskin, Eric S.},
   year={1985},
   title={The theory of implementation in {N}ash equilibrium: a survey},
   booktitle={Social Goals and Social Organization},
   editor={Leonid Hurwicz and David Schmeidler and Hugo Sonnenschein},
   pages={173-204},
   publisher={Cambridge University Press},
   addess={Cambridge}
 }

called bibl.bib and in the same directory. Running pdfLaTeX gives me a perfectly good file with missing citations, but when running BibTeX it responds I couldn't open database file bibl.bib.

I think this might be some kind of bigger configuration issue with TeXWorks, because earlier on in the troubleshooting process I tried similar things with biber and biblatex. They were similarly unable to find my .bib file when it was named sources.bib. However, when I called it something else (I think references.bib), biber was able to find a completely different list of sources, which appears to be part of an example in the documentation.

This makes me think that biber/BibTeX/TexWorks doesn't know to look in the current directory before trying other places when looking for a file. Unfortunately, I have no idea how to fix that, or even how it happened in the first place.

I am running Windows 10. I also relatively recently uninstalled TexLive and switched to MikTex.

EDIT: My problem was Windows renaming my file with a .txt extension, then hiding it from me. Since extension hiding is the default behavior, I figure I should leave this question up as another thing to check with this problem.

Answer 1

Windows 10 has extension hiding in filenames turned on by default, and as a result my .bib files had extensions like .bib.bib and .bib.txt, which was preventing biber from finding them.

I've resolved the issue (and turned off extension hiding).