With Maya 2020, MImage::writeToFile does not support Japanese characters in the pathname parameter. The file is output to the file system, but its name is made up of garbled characters.
We tried the same code under the same conditions with Maya 2019 and the output file was written with the correct name, so the problem appears to have been introduced with Maya 2020.
The tests were made with Maya running with the Japanese UI and the problem was observed with Maya 2020.4.
