how to call a luar instead of it having you pick it

Hi,

I'm fairly new to lua coding but am looking to play around with the snapandplay.lua and learn from there.  looking at the snapandplay.lua, can anyone point out what needs to be modified to playback a specific .luar file instead of having me choose?

For example, when executing the snapandplay, and clicking on playback, it has me pick a luar file located in /luar folder.  I'd like it to open a luar file instead such as "luar/testing.luar" instead of having me choose.

Thanks for your help.
Kat