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I have a .NET project that refuses to be built in VS2013 because of a referenced library. The problematic library has culture attribute set to neutral. This causes the following error:

Invalid argument. Culture is not supported.
Parameter name: name
Neutral is an invalid culture identifier.

Which tools should be used to change the culture attribute, or indeed any other assembly attribute, of a dll file?

I have tried to disassemble and reassemble it with no success:

Using JetBrains dotPeek I get 

Cryptographic failure while signing assembly 
'...\Athena.AsePCOS.dll' -- 
'Error reading key file '..\..\ASEKey.snk' -- The system cannot find the 
file specified. '

and I am not sure where to find this file or if I should create it myself.

I've also tried to use Reflexil tool but I assume it is not meant to be used for editing assembly attributes.

Limbo Exile
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  • You don't have the private key that was used to sign the assembly. Rather a big deal with code that works with smart cards. The owner of the DLL has it, more than one reason to pick up the phone and ask for help. – Hans Passant Aug 19 '14 at 14:39
  • Do I really need that key? I created a dummy key myself and it solved the problem, at least temporarily. – Limbo Exile Aug 20 '14 at 05:40

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