刪除檔案關聯

(just now it worked fine with an association that created through Windows Explorer):

Let .<ext> be the extension you want to deassociate.

With a registry editor (e.g. regedit.exe),

1. go to

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\

remove the subtree .<ext>

2. go to

HKEY_CLASSES_ROOT\

remove the subtree .<ext>

remove the subtree <ext>_auto_file

修改預設檔案關聯

選擇預設程式, 如下圖所示

 

選擇你想要關聯的副檔名及程式即可