Command Editor-Start In:?

Command Editor - Start In:
When I execute a Program using Command Editor I use Start in: for my save directory. All my programs ignore the Start in: directory and mostly want to save to the Document Folder, Which I never use.
My thought is the Start In: folder might have a different purpose. If so what might that be?
Bob

It sets the current directory for the program that is launched. But it's completely up to that program whether it defaults to loading/saving files from the current directory, or somewhere else. The other program can change its current directory as well, if it wants to.

A lot of text editors do work vs the current directory by default, but a lot of other software also ignores it.

Some programs need the current directory to be set to the folder where their .exe file is, since they try to load other resources (DLLs, etc.) relative to the current dir. (Usually a bad thing; they should work out their exe path and load things relative to that, but not all programs are well written.)