Studio 2015: JA characters in a text file (UTF-8) garbled when opened for translation

Question

I have been translating similar files (Japanese text files encoded UTF-8 without BOM) all week. Yesterday it was fine. Today I simply added a new text file to the same project without changing any settings, prepared the file for JA to EN translation and opened it for translation, only to see all JA characters in the source file garbled. English characters are displayed properly. I deleted the XLIFF files and reloaded the text file; same problem. I closed and restarted Studio 2015 but problem is not solved. What should I do? Thanks in advance for your advice and suggestions.

Paul · Accepted Answer

Hi Hajime Sato , 
 
I can only think that there must be something in this new file affecting the encoding of the characters. What happens if you open this file on its own as a single file project? Is the content of this one different to the rest in any way, no encoding declaration, no BOM, characters already corrupt? 
 
Regards 
 
Paul

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Studio 2015: JA characters in a text file (UTF-8) garbled when opened for translation