opus-tools requires a certain order of arguments

when encoding with opusenc.exe, version 0.1.6 (using libopus 1.1-alpha) downloaded from mozilla.org, this does not work:

opusenc output.opus infile.wav

and gives the error:

output.opus: No such file or directory

however, this does work:

opusenc infile.wav output.opus

this is not huge at all in my opinion, just causes a little confusion. especially when foobar2000 is involved, which gives the most vague error available.