I have three versions of Matlab on PC: R2017a, R2018b, and R2019b. I want to free up my laptop and delete these unused versions. I have a bunch of files that were created with R2017a. When I open these files they will open up R2017a instead of R2019B (even though I have R2019B on my PC). If I delete R2017a and R2018b from my PC, what will happen to these old files which default-open R2017a ? I ask because I still use those old files regularly for my academic research.