Take the 2-minute tour ×  I'm trying to run Fluenz on my
computer and it's a .osx file. When I try to open it, it opens
in Textmate. Kind of odd. Does anyone know how to restore its
original default program? I think that I might have changed all
.osx files to open in Textmate some time in the past for a
programming project, but I don't know what the original was.
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down vote accepted  There is no real default program, as the
file type is apparently not known by OS X (at least on my
system). It depends on the applications you installed on your
system.  You can always right-click and select Open With… to see
which applications claim support the file type. If the desired
program is in the list, you can Get Info the file, and then
change the program to use for opening all files of this kind.
This setting is in the Open with section by selecting it and
then pressing Change All….  enter image description here  To
remove the custom association with TextMate