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For example I cannot drag and drop folders and .py files to the meld using launcher but it accepts them perfectly.

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up vote 4 down vote accepted

Locate the .desktop of app you wish to adjust, in the case meld & open in a text editor.

Usually there will be a line, MimeType=, just add to it the appropriate type, if you don't know then a right click > Properties > Type will show.

So in this case, 'Meld', you'd add this to the end of the MimeType= line

text/x-python;inode/directory;

If for some reason the line didn't exist the just add it, like

MimeType=text/x-python;inode/directory;

Usually a logout/in will be needed to reflect changes.

For meld - try also editing the Exec= line in the .desktop to this

Exec=meld %F

Other possibilities for letter would be f or U, though glancing at the report I'm not sure it will matter much here with meld

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