Cant create a jslib file

Im following the Unity Learn tutorial for getting started with web stuff (this one ) and the first thing on step 5 is to create a jslib script file by renaming a regular C# script. When the guy does this it works perfectly, but when I rename my file and delete the .cs ending and change it to .jslib, it just changes the name but dosent change the file type or anything. What do i do?? :frowning:

also srry if this isnt the right place to post a question, im just lost n tired man :sob:

Ok so what seemed to fix things was renaming the file in Visual Studios instead of in file finder.