Comment 1 for bug 49217

sxian,

Thank you for your bug report. We have received one other report where a user reported files being renamed in a similar way. They reported that it only affected file name with a space " " in them.

I'm sorry, but to give us a meaningful answer, and because Ubuntu will fix any files before you can show a report, you'll need to do some extra work.

Can you please:
 * Boot into Ubuntu
 * run: sudo chmod -x /sbin/dosfsck
 * Boot into DOS/Windows
 * Create a file with an illegal character like you show
 * Boot into Ubuntu
 * run: sudo chmod +x /sbin/dosfsck
 * run: dosfsck -v -n <partition>

Then attach the output of the last command to this bug report.