v15.2 - Unexpected script related message on Project Reload

[Paolo F Cantoni]

When we issue a Project Reload under v15.2 we get a message:
"Choose Remove to unload script from the scripter.
Choose Delete to permanently delete file from the disk."
Three buttons:
[Remove] [Delete] [Cancel]

Cancel has NO effect.  So we are using Remove as the appropriate action.

The message doesn't seem to occur with v16.  However, we're concerned that a user may obliterate a script file, accidentally (by pressing the [Delete] button).   

Does anyone know why the message occurs and whether it has been removed in v16 by design or by accident?

TIA,
Paolo