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I don't think locks are mandatory in Windows, my observation is that they're optional.
WinRAR does not lock an open ZIP, Irfanview does not lock an open JPG, nor do notepad++ or notepad lock an open TXT file. With each of those programs I can change the folder path to a file they have open, but then I have deal with the error when I try to save it. There's nothing any program can do about that... except WinRAR, Irfanview etc.
I would always prefer to have the folderpath change refuse the request, rather than allow me to blithely proceed, thus forcing me to deal with the consequences later. The effort to save and close the file in order to allow the folderpath change to proceed, will almost always be less than saving a copy and getting it to where it ought to be. And the latter is an exception to normal practice, all of which makes it prone to yet more user mistakes.
BR
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