I still have .BAS files floating around I wrote in QuickBASIC. I have no idea why.
Some where actually useful - like a program that read files (mainly meant for things like executables) and extracted plain text from it. Handy for finding text in files you couldn’t readily open in anything else.
Another renamed files with various switches like title case, or padding numbers with zeros. Was handy for renaming MP3 files for example. Actually they were probably S3M modules back then heh…