1. Your command is to open the file. But before going to the disk Windows might look if it's still in memory. Only Microsoft can tell if it does or not.
2. Save writes a file. If it happens to use the same location on the disk, you could say it's the same file that's updated. If it uses a different location, you can say it's a new file. Only Microsoft can tell if it does or not, depending on what factors.
3. Save as makes a new file. Nothing happens to the old file.
4. I wouldn't call it logging. It just writes some attributes of the file in the dictionary.
I use Windows 7
I open paint and save a PNG file
The file created is file A
File A has the following properties
If I open file A in paint later, then what am I actually looking at?
A copy of the picture made by paint?
A copy of file A?
A cached file?
If I then press SAVE, the following happens:
The whole file is written anew? Is it a whole new file?
The old version of the file is being moved or copied to cache?
Then the following is added to the new file:
The created date remains the same and is written to the new file
The new modified date is written to the new file
The new accessed date is written to the new file
What remains from the old version of file A?
If I then press SAVE AS, what is different from SAVE?
The created date changes
How much data from earlier does a PNG file keep?
When I SAVE
When I SAVE AS
I have opened a PNG file in various software, to look at the metadata
I can only see the latest created, modified and accessed dates.
Does it only log the most recent dates?
Will it overwrite the date every time?
Does it log older dates from before?
Thanks a lot for answering