How to fix the "CSOM MilesAsync OpenOrFindFile ("audio\ship\general japanese.mstr") failed to open files; try resyncing" or any other language the issue appears in.
How to Fix the Issue
- Change the game to Japanese (or your preferred language) in its settings.
- After the download is finished go to "Steam\steamapps\common\Apex Legends\audio\ship" copy BOTH "general_japanese.mstr" and "general_japanese_1.mstr" to a separate folder on your desktop.
- Change your language back to Japanese this deletes the Japanese files from the audio folder and you will have to copy them back into the audio folder.
- Run the game it should work.
This is how I fixed the issue for myself hope it helps others.