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Re: File corruption that isn't?

David,

The generic icon is probably showing up since the file has lost its resource fork which contains the Creator & Type codes.  Without this info, you get a generic icon and the system doesn't know what application to use for opening the file.

To confirm this, download a utility that allows editing of resource forks (there are many), open up the good copy of the file to get its Creator & Type codes, then apply these codes to the bad file.

............................................
DULOCK CONSULTING
Bryan Dulock  |  ACTC 10.4
281-584-0476
Houston, Texas

On Aug 31, 2006, at 10:16 AM, David Knuth wrote:

Hi,

I have an Xserve running 10.4.7 with a software RAID across two 40 GB drives. The RAID is configured as mirrored and was set up using Disk Utility.

On the RAID are our electrical schematics for our custom circuit boards, which were created using DesignWorks.  This is an application that has had the minimal amount of work done to it to make it run on OS X, since it was created back in the System 7 days (I think).

I went to open the schematics today, only to find their icons were gone, replaced by the generic blank document icons.  When I double click a schematic, I get the dialog asking me to choose an application to open it.  I navigate to DesignWorks, but it is grayed out.  I then change the constraint from Recommended Applications to All Applications from the popup menu and can select DeisgnWorks.

Then a new dialog appears that says:

An error occurred while changing the application that opens "schematic" because not enough information is available.

Do you want to open "schematic" with "DesignWorks"?

I click Update (as opposed to Cancel or Don't Update).

DesignWorks opens and then beeps.  The file does not open.

I do have an exact copy of this file that was archived  long ago with Stuffit, sitting on this same RAID.  I unarchived it and saw the icon is there.  I can double click it and open the file.

The mystery in this is that the sizes of these two files are identical when I do ls -l, but the Finder is reporting the failed file is 4 kB larger than the working one.

Also, using diff on the two files shows no difference.  To beat a dead horse deader, I did xxd on the files and compared the hex dumps of each. They, too, are identical.

If I copy both files from the Xserve to my desktop, the problem follows the file.  The previously archived one comes across with the icon and can be opened. The failed one comes without and icon and cannot be opened.

So, why can't DesignWorks open the failed file, when it is identical (from all measurements I can make) to the archived version?  And why is the Finder reporting a difference in size when the shell is not?  Is there a .DS_Store file or something like that I can delete to fix this?  

Is the file really corrupt?  I don't believe it is.  Ideas?

David

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