File names in different languages

Just for a little added context, below is what the file names look like after I download them. The underscores were all originally Japanese text; the original Japanese titles were also quite short but got extended to those huge lines. On the platform, the original file names appear, Japanese is also supported elsewhere on the survey platform, but just downloaded files come out like this.
The top file is an example of a file whose name grew past the character limit and I had to add an extension at the end to open it. The name was originally in Japanese and followed by English, all the English is cut off as you can see.
Any insight or fix into this would be much appreciated. We expect many file submissions to include some Japanese in their titles

This is an old question that was never answered but I would like to bump this up again since I still run into this issue. Any help would be appreciated!