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why DLL file's modified time is earlier than created time

Posted on 2004-09-09
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Last Modified: 2010-04-13
Hello Experts,
I find that some dll file's modified time stamp is earlier than their created time stamp, why? Is it normal or abnormal?
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Question by:siyu
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Expert Comment

by:jdeclue
ID: 12018410
Sometimes the created time stamp gets set when a file is copied, and the modified can show the last time a developer closed the file, etc. depends on how the files were copied, what media etc, whether bits were reset etc.

J
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by:jdeclue
ID: 12018423
Oh yeah, that can also happen if the time was wrong on a machine when it got the created stamp and then it was modified later, etc...

J
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by:siyu
ID: 12018860
So, it has nothing to do with the content of file, right?
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jdeclue earned 500 total points
ID: 12019170
It should not. If I go into my Winnt\System32 folder, and view both Created and Modified stamps, I find approx 50-60 dll's that have older modified dates than the created dates. These files have a Created date, from when they were installed on my computer. The modified date on these files look like they are from when the file was modified. I do not think that this is unusual.

J
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by:siyu
ID: 12019362
jdeclue, thank you very much for anwsering my question, I think you anwser is reasonable and acceptable, I will reward my 125 points to you.

But, just for my curiosity, how did you find out that approx 50-60  dll's that have older modified dates than the created dates on your system?  If I go into my Winnt\System32 folder, I found there are a few thousands dlls, it's too clumsy to check one by one and sum them up, is there any utility to help?
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Expert Comment

by:jdeclue
ID: 12019416
I opened Windows Explorer, browsed to System32 and then in the right hand windows selected Detail view, right click on the column at the top and add Modified and Created. It then listed both dates. I then sorted by Modified and look at the oldest. The majority of them had a modified date older than the created date.

Here is some information on the 3 dates associated with a file. http://www.xxcopy.com/xxcopy15.htm


J
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by:siyu
ID: 12019552
Thanks again!
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