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I don't have source code to recompile the application. It doesn't throw any exception. I looked into event viewer and report.wer file it says stopped working after loading all dlls. Nothing in details.
If you don't have the source then there is nothing we can practically do for you: it could be anything from missing configuration files, to hard-coded connection strings - we can;t tell without decompiling the assembly. ANd that may well be obfuscated to prevent it being understandable.
Go back to whoever has the source of the application, and see if they can help - it's by far the quickest way to sort this out.