Custom File Properties and Winzip

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HI
I have a file with my own extension, when i right click on it, it shows "General,Class,Security,Summary"properties.
"Class" is custom property added by me.

"Class" property page contains :

GUID : 1233344566
NAME : XXXXX
AGE : N/A

Now zip this file and unzip the same and check my custom properties,they are as below :

GUID : N/A
NAME : N/A
AGE : N/A

Please anyone tell me the reason for loss of info after unzipping the file.

thanks in advance
Anandi

Posted 15-Sep-11 2:47am

Anandi.VC

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Timberbird 15-Sep-11 9:27am

How are these custom properties stored? The reason could be that your attributes are stored in a file stream

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Timberbird · Accepted Answer · 2011-09-15T03:36:00

Solution 1

Well, I do think your problem is connected to alternative data streams. This kind of info must be lost during compressing. To check this, try examining whether there are any streams connected to file in question before and after compression. For example, you could use Streams[^] utility by Sysinternals

Posted 15-Sep-11 3:36am

Timberbird

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Anandi.VC 19-Sep-11 2:13am

If not "Alternatre Data Streams" what else should i use ?
How Adobe is implementing its Custom Properties Tab "PDF" that retins info when zipped and unzipped ?

Please give me some clue.

Sravanthi

Timberbird 19-Sep-11 2:47am

As far as I know, WinRAR allows you to preserve alternate streams in an archive

Anandi.VC 19-Sep-11 3:37am

WinRar,7-ZIP are not Preserving.

Sravanthi

Timberbird 19-Sep-11 5:12am

It's strange, this article says it is. Have you tried -os switch or corresponding option in GUI as this article describes? It also says this feature works on RAR files only

Anandi.VC 19-Sep-11 5:58am

In WinRAR : Right click a file and Select "Add To Archive" -> Select Advanced Tab -> check "save file streams" then the Info is retained both in my custom properties tab and in summarys tab.
Thank you for this info. But i want this kind of thing in all kinds zipping.Is ther any way for this ?

Sravanthi

Timberbird 19-Sep-11 7:11am

Sorry, I'm definitely not an expert in this area, so all I can think of is a clumsy solution like saving file streams in files with corresponding names before archiving, and restoring them after decompression. But this requires extra actions to be performed.

Custom File Properties and Winzip

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Custom File Properties and Winzip

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