When you open a file, the file manager performs the default action for that file type. For example, opening a text file will display it in the default text editor, while opening an image file will display the image in the default image viewer.
The file manager checks the extension of a file to determine the type of a file. If the file has no known extension, the file manager examines the contents of the file. Executing the Default Action
To execute the default for a file, double-click on the file. For example, the default action for audio files is to play the it with the default music playing application. In this case, you can double-click on the file to open the file in the music player.
You can set Thunar preferences so that you click once on a file to execute the default action. For information, see the section called Behavior Preferences.
To execute actions other than the default action for a file, select the file that you want to perform an action on. Choose the desired action from the Open With choices available in File menu or an Open With submenu.
To add actions associated with a file type, perform the following steps:
The action you have chosen is now added to the list of actions for that particular file type. If you enabled the Use as default for this kind of file option or there was no prior action associated with the type, the newly added action is the default.
You may also add actions using the Open With button under File → Properties....
To modify the actions associated with a file or file type, perform the following steps:
To remove a previously added action for a file type, bring up the Open With dialog as described above, right-click the action you want to remove and choose Remove Launcher.
The file properties window shows more information about any file or folder in the file manager. With this window, you can also do the following:
To open the file properties window, perform the following steps: