pdfLaTeX works fine; pdfLaTeX+MakeIndex+BibTeX returns error. There is nothing in document but \documentclass, \begin and \end document and a word

Question

I am using Texworks Version 0.6.2 (MiKTeX 2.9.6350 64-bit). Originally I had a bibliography but I have taken it out and the error is the same.

I am running a file containing:

\documentclass{article}

\begin{document}
Test
\end{document}

pdfLaTeX gives:

This is pdfTeX, Version 3.14159265-2.6-1.40.18 (MiKTeX 2.9.6350 64-bit) entering extended mode (WorkedExample.txt LaTeX2e <2017-04-15> Babel <3.10> and hyphenation patterns for 75 language(s) loaded. ("C:\Program Files\MiKTeX 2.9\tex\latex\base\article.cls" Document Class: article 2014/09/29 v1.4h Standard LaTeX document class ("C:\Program Files\MiKTeX 2.9\tex\latex\base\size10.clo")) (WorkedExample.aux) [1{C:/ProgramData/MiKTeX/2.9/pdftex/config/pdftex.map}] (WorkedExample.aux) )<C :/Program Files/MiKTeX 2.9/fonts/type1/public/amsfonts/cm/cmr10.pfb> Output written on WorkedExample.pdf (1 page, 11236 bytes). SyncTeX written on WorkedExample.synctex.gz. Transcript written on WorkedExample.log.

pdfLaTeX+MakeIndex+BibTeX gives error:

This is pdfTeX, Version 3.14159265-2.6-1.40.18 (MiKTeX 2.9.6350 64-bit) entering extended mode (C:/Bugs/WorkedExample.txt ! Undefined control sequence. l.1 \documentclass {article} ?

MakeIndex (alone) gives:

Couldn't find input index file WorkedExample nor WorkedExample.idx. Usage: makeindex [-ilqrcgLT] [-s sty] [-o ind] [-t log] [-p num] [idx0 idx1 ...]

BibTeX gives:

This is BibTeX, Version 0.99d (MiKTeX 2.9.6350 64-bit) The top-level auxiliary file: WorkedExample.aux I found no \citation commands---while reading file WorkedExample.aux I found no \bibdata command---while reading file WorkedExample.aux I found no \bibstyle command---while reading file WorkedExample.aux (There were 3 error messages)

But worked fine when I had a citation present so I don't think this is the problem.

Answer 1

The document was saved as WorkedExample.txt, when saved as WorkedExample.tex or WorkedExample.ltx it compiles fine.