We have looked into it, repeatedly. And we should not write a file that is in use by another app (even if we could). There is nothing that Adobe can do about the fact that some other application has the file in use. We're already doing what we should by not making a mess of your file and telling you about the problem. When Photoshop saves a document, it deletes the current file, creates a new blank file with the same name, and then attempts to open the new file for writing. That is incorrect. Photoshop does not delete the current file first. Photoshop creates a new file with a unique name, writes to that temporary file, then only when the save is completed successfully does it replace the older file. That is known as a "safe save", and even has some OS support for the action. Finally, it writes the image being saved to the new file. If any part of this process fails, the original file is lost. Again, incorrect. If the save fails, the original file is left intact. If an original file is destroyed by a safe save, then there is a problem at the file system or operating system level.
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