Hi @guiselle, what is the application that the idx file will ultimately be used for?
So I am not very familiar with .idx files used by these applications, but if it is a text file that is formatted a certain way for these applications, then you can write to a file ending in ".idx" using a csv file format. I write to a .mac file with one application and here is how I do it. Hopefully this will get you on the right track.
I did a quick test and it worked! Thank you so much!
Okay. You bet!