源自：Ubuntu 中改变文件的默认打开方式
1. 相关配置文件
- 全局配置
- /etc/gnome/defaults.list
- /usr/share/applications/mimeinfo.cache
- 个人配置
- ~/.local/share/applications/mimeapps.list
- ~/.local/share/applications/mimeinfo.cache
2. /etc/gnome/defaults.list部分内容
- [Default Applications]
- application/csv=openoffice.org-calc.desktop
- application/excel=openoffice.org-calc.desktop
- application/msexcel=openoffice.org-calc.desktop
- application/msword=openoffice.org-writer.desktop
- application/ogg=totem.desktop
- application/pdf=evince.desktop
- application/postscript=evince.desktop
- application/rtf=openoffice.org-writer.desktop
- application/tab-separated-values=openoffice.org-calc.desktop
- application/vnd.lotus-1-2-3=openoffice.org-calc.desktop
- application/vnd.ms-excel=openoffice.org-calc.desktop
- application/vnd.ms-word=openoffice.org-writer.desktop
- application/vnd.rn-realmedia=totem.desktop
- text/plain=gedit.desktop
3. /usr/share/applications/mimeinfo.cache部分内容
- [MIME Cache]
- text/plain=gedit.desktop
- application/vnd.ms-excel.template.macroenabled.12=openoffice.org3-calc.desktop
- audio/x-s3m=gnome-mplayer.desktop
- application/vnd.ms-word=openoffice.org3-writer.desktop
- application/x-lzma=file-roller.desktop
- video/x-mng=gnome-mplayer.desktop
- image/x-portable-bitmap=f-spot-view.desktop;eog.desktop;
- x-directory/normal=nautilus-folder-handler.desktop
- image/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
- text/plain=gedit.desktop
- 改为
- text/plain=gvim.desktop
(2). 修改/usr/share/applications/mimeinfo.cache文件
- text/plain=gedit.desktop
- 改为
- text/plain=gvim.desktop
5. 另外一种解决方案
右击文件 --> 属性， 如下图
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。
