Set reserved icon for application

[taiwbi]

Is there anyway to set a reserved icon for .application file? like I have a file with this icon config:

Icon=telegram

But is there anyway to set a second icon to be shown if the current icon pack doesn't have telegram icon? like this

Icon=telegram,/home/user/telegram.png

but this doesn't work.
Is there anyway to do this correctly?

[Dennis N]

You can't have two options on that line. If you have a icon you want to use, you can specify it there by full path and file name. Otherwise, the OS starts looking in your chosen icon theme for a match. Your icon theme can name other themes to check with the Inherits= line found in an index.theme file located in the theme folder.