https://snap.berkeley.edu/snap/snap.html#present:Username=d4s_over_dt4&ProjectName=file%20system%20for%20sn8.1.0
you guessed it im making another os(but this one wouldn't be so easy to import apps,because there is file system and window system)
If you store text in a file then its a text file
If you store a script in a file then its a script file
If you store a costume in a file then its a costume file
If you store a sound in a file then its a sound file
If you store a list in a file then its a----wrong guess,not a list file----folder
/j