Closure compiler does not work on Windows at least if path contains UTF-8 characters

If an input file name contains non-7bit-ASCII characters in it, Closure fails to operate.

STR:

1. Install Closure compiler to directory "☃äö Ć € 🦠". (not mandatory, but for good measure to see if any issues arise from that)
2. Pass an input file "☃äö Ć € 🦠.js" to Closure compiler as --externs or --js.

Results in

C:\☃em sd äö Ć € 🦠\emsdk\emscripten\main> dir äö.js
 Volume in drive C has no label.
 Volume Serial Number is 8847-8E7D

 Directory of C:\☃em sd äö Ć € 🦠\emsdk\emscripten\main

03/16/2021  06:18 PM             3,472 äö.js
               1 File(s)          3,472 bytes
               0 Dir(s)  1,757,394,030,592 bytes free

C:\☃em sd äö Ć € 🦠\emsdk\emscripten\main> node_modules\.bin\google-closure-compiler --externs äö.js --js_output_file out.js --js a.js
[ '--externs', 'äö.js', '--js_output_file', 'out.js', '--js', 'a.js' ]
ERROR - [JSC_READ_ERROR] Cannot read file äö.js: äö.js

1 error(s), 0 warning(s)

C:\☃em sd äö Ć € 🦠\emsdk\emscripten\main> node_modules\.bin\google-closure-compiler --externs a.js --js_output_file out.js --js äö.js
[ '--externs', 'a.js', '--js_output_file', 'out.js', '--js', 'äö.js' ]
ERROR - [JSC_READ_ERROR] Cannot read file äö.js: äö.js

1 error(s), 0 warning(s)

3. Pass UTF-8 chars as output file :

C:\☃em sd äö Ć € 🦠\emsdk\emscripten\main> node_modules\.bin\google-closure-compiler --js a.js --js_output_file äää.js
[ '--js', 'a.js', '--js_output_file', 'äää.js' ]

C:\☃em sd äö Ć € 🦠\emsdk\emscripten\main> dir *.js
 Volume in drive C has no label.
 Volume Serial Number is 8847-8E7D

 Directory of C:\☃em sd äö Ć € 🦠\emsdk\emscripten\main

03/16/2021  06:18 PM             3,472 a.js
03/16/2021  06:24 PM             5,595 äää.js
               2 File(s)          9,067 bytes
               0 Dir(s)  1,757,393,338,368 bytes free