title: Rmarkdown unable to locate lua filter when knitting to word
body: <p>I am trying to knit some R markdown code to word at work. After updating all of my packages, I am unable to create any word documents. The error that I am getting is:</p>
  
  <pre><code>"C:~/AppData/Local/Pandoc/pandoc" +RTS -K512m -RTS TestDoc.utf8.md --to docx --from markdown+autolink_bare_uris+tex_math_single_backslash+smart --output TestDoc.docx --highlight-style tango --reference-doc word-styles.docx --lua-filter "\\~R/win-library/3.5/rmarkdown/rmd/lua/pagebreak.lua" 
  Error running filter \\?\UNC\~/R/win-library/3.5/rmarkdown/rmd/lua/pagebreak.lua:
  \\?\UNC\~/R/win-library/3.5/rmarkdown/rmd/lua/pagebreak.lua: openBinaryFile: does not exist (No such file or directory)
  Error: pandoc document conversion failed with error 83
  Execution halted 
  </code></pre>
  
  <p>Because I am not an administrator of the network at work, I am unable to go into the files to see if the lua filter is there. Is there anyway to get around this error?</p>
  
  <p>Thanks!</p>