App fails code signature checking after extraction

[GoogleCodeExporter]

After downloading and extracting this app: http://www.git-tower.com/download

I get an error to the effect that the developer did not sign the app with 
Developer ID: https://twitter.com/dmdeller/status/491688689542909952

However, when extracting using Archive Utility, I do not get this error 
message. (The developer did in fact sign the app with Developer ID).

Original issue reported on code.google.com by dmdel...@gmail.com on 23 Jul 2014 at 12:53

[GoogleCodeExporter]

I see the same issue with a downloaded app.  If I unzip the file with 
"unarchiver" I am told that the application is damaged and to dispose of it.  
If I unzip the same file with the system Archive Utility.app the extracted 
application will launch fine.

File is at <http://infinitekind-md980.s3.amazonaws.com/Moneydance.zip> but I 
can attach a copy if you want a large file.

Original comment by s...@curg.org on 27 Jul 2014 at 8:23

[GoogleCodeExporter]

This seems to be some kind of odd OS X issue with extended attributes on signed 
apps. I have not yet managed to find out if this can be worked around in The 
Unarchiver or not, or if Apple will have to fix it.

Original comment by paracel...@gmail.com on 28 Jul 2014 at 7:52