As the error message suggests, it's attempting to execute a command named "files", so you could try a backslash (presuming the exe is in a subdirectory "files" — otherwise, what's the files/ supposed to be doing?) 

system ("files\\pdftotext.exe -nopgbrk -q \"$file\"" );
              ^

[download]

Not all components of Windows handle forward slashes and backslashes equivalently...

In reply to Re^3: System path by Eliya
in thread System path by welle

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