How can I make PCManFM open plain text files with Leafpad by default in Lubuntu?

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http://askubuntu.com – When I'm using PCManFM, I sometimes do the following. I right-click in an empty place in ~/, and choose Make new... --> Empty File. I type some text in it, like 'blabalballabl', and then I save it, e.g., as test. Now, I double-click this file. Leafpad won't open the file, but instead PCManFM will say that the file is executable. It then asks if I want to execute the file or not. I don't want this to happen, I just want Leafpad to open the file. Right-clicking the file, then changing the default application to open this type of files doesn't help. Is there any way to force PCManFM to open fil (HowTos)