Hey there!
I apologize your question took so long to try to get an answer to.
I had a similar issue when trying to use certain files for some projects.
Check to make sure you have Japanese set as your language for non-unicode programs
- Open Control Panel
- Go to "Clock and Region" and click "Region"
- Go to the "Administrative" tab in the box that shows up
- Press "Change System Locale" and select "Japanese (Japan)" from the drop-down menu.
Important thing here: make sure the box that says "Beta: Use Unicode UTF-8 for worldwide language support" is UNCHECKED, this causes a heap of problems for programs and files that just cause them to appear strange or incorrectly. Upon unchecking this, the problems I was having with programs and files disappeared entirely, and I was able to use everything correctly again.