how to rename the sprites from scratch3

[nilkanthagholap]

hi,

I scratch to school kids. and not a pro programmer. i have found all the sprites that are used in Scratch3 (https://scratch.mit.edu/). and want to use them in my sessions on HTML. but by default from the program files tthe sprites are namedd like this 76a342169e90e0b459e48ed02eefa11a.png (https://github.com/ysun/scratch3.0/blob/master/nwjs/app/76a342169e90e0b459e48ed02eefa11a.png)

but the scratch3 program knows how to show it by name in the app.
so is there any way i can use a code to rename them all. that will help me to use them with kids.