1. 相关配置文件

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  1. 全局配置  

  2. /etc/gnome/defaults.list  

  3. /usr/share/applications/mimeinfo.cache  

  4. 个人配置  

  5. ~/.local/share/applications/mimeapps.list  

  6. ~/.local/share/applications/mimeinfo.cache  

2. /etc/gnome/defaults.list部分内容
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  1. [Default Applications]  

  2. application/csv=openoffice.org-calc.desktop  

  3. application/excel=openoffice.org-calc.desktop  

  4. application/msexcel=openoffice.org-calc.desktop  

  5. application/msword=openoffice.org-writer.desktop  

  6. application/ogg=totem.desktop  

  7. application/pdf=evince.desktop  

  8. application/postscript=evince.desktop  

  9. application/rtf=openoffice.org-writer.desktop  

  10. application/tab-separated-values=openoffice.org-calc.desktop  

  11. application/vnd.lotus-1-2-3=openoffice.org-calc.desktop  

  12. application/vnd.ms-excel=openoffice.org-calc.desktop  

  13. application/vnd.ms-word=openoffice.org-writer.desktop  

  14. application/vnd.rn-realmedia=totem.desktop  

  15. text/plain=gedit.desktop  

3. /usr/share/applications/mimeinfo.cache部分内容
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  1. [MIME Cache]  

  2. text/plain=gedit.desktop  

  3. application/vnd.ms-excel.template.macroenabled.12=openoffice.org3-calc.desktop  

  4. audio/x-s3m=gnome-mplayer.desktop  

  5. application/vnd.ms-word=openoffice.org3-writer.desktop  

  6. application/x-lzma=file-roller.desktop  

  7. video/x-mng=gnome-mplayer.desktop  

  8. p_w_picpath/x-portable-bitmap=f-spot-view.desktop;eog.desktop;  

  9. x-directory/normal=nautilus-folder-handler.desktop  

  10. p_w_picpath/x-dcraw=f-spot-view.desktop  

4. 更改文件默认打开方式

案例：更改文本文件的默认打开方式从gedit改为gvim

(1). 修改/etc/gnome/defaults.list文件

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  1. text/plain=gedit.desktop  

  2. 改为  

  3. text/plain=gvim.desktop  

(2). 修改 /usr/share/applications/mimeinfo.cache 文件
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  1. text/plain=gedit.desktop  

  2. 改为  

  3. text/plain=gvim.desktop  

一般程序的快捷方式存放在/usr/share/applications 目录下这些时已经安装好的应用程序，有的时候，我们使用的应用程序是解压缩后直接使用的，比如大名鼎鼎的文本编辑器Sublime Text 2.

5. 另外一种解决方案

右击文件 --> 属性，在打开方式页中修改即可

6. 注意

网上有很多帖子都是只提到了/etc/gnome/defaults.list这个文件，而没有提到/usr/share/applications/mimeinfo.cache这个缓存文件，结果当然是修改无效咯。

当然，如果你把缓存文件删除也行。