How can I programmatically access the file property that indicates who was the last person to save the file?

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It depends on the programming language and file system being used. In general, you would need to use a file system API provided by the operating system.

For example, in Windows, you can use the GetFileAttributesEx function to retrieve information about a file, including the owner and last modified time. In Python, you can use the os.stat() function to retrieve similar information.

Here's an example in Python:

import os

# Replace 'file.txt' with the path to your file
stat_info = os.stat('file.txt')
last_modified_time = stat_info.st_mtime
owner = stat_info.st_uid

You can then use the owner information to look up the username associated with that UID on your system. Again, the specific method for doing this will depend on the operating system you are using.