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We have .Net 4.0 code that is using Shell32 to unzip files. There is nothing wrong with the unzip code, since it has been working without issue for a few years now.

We recently sent out a software update and now, at a few of our sites, the unzip is not returning a response. The file is downloaded, unzip is called and then all logging stops. It is behaving like it is waiting for a lock to be released on some thread.

I haven't isolated anything that is different between the sights were it works and the ones were it is not working.

Any ideas would be greatly appreciated.

Thanks,

What I have tried:

1. Tried to reproduce in our lab - works as expected.
2. Wrote a test app to try different methods of reproducing - still working as expected
3. Tried examining the code for recent defect fixes - This should be the cause, but none of those changes were related to, or near, the call to unzip.
Before you ask,
No we cannot use .Net 4.5, because it is not supported on Windows Server 2003.
No we cannot use a 3rd party library, because this code was working until now.
Posted
Updated 3-Jul-18 9:03am

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