Is there a best practice for a file extension for a data file?

I think this has come up before, but can’t find it in a search.

I have a script that is writing data to a file in the form of a list.

I’m wondering what I should use for a name extension.

I don’t want to use txt or any variation of that, because I don’t want it to open in a text editor.

At some point I’m going to set up a droplet so the file can be directly edited (via MyriadTables) but in the mean time is there a best practice?

Is there an extension that would open a data file in Script Debugger?

It sounds like you should just use your own extension.