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並前往https://askubuntu.com/questions/1369211/same-file-type-different-icon-how-to-reset-it

Same file type, different icon. How to reset it - Ask Ubuntu

I found the solution. The problem isn't the line ending or the characters set (UTF-8, ASCII...). If in the file there is the sentence ...

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查詢 「Reset icon」的人也找了：

  1. Reset icon
    2.
  2. Refresh icon
    3.
  3. Restart icon
    4.
  4. 重新 整理 icon
    5.
  5. Icon restart
    6.
  6. Save as icon
    7.
  7. Pause icon
    8.
  8. Clear icon
    9.