How we can decrypt an encrypted file used for HDL

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Hi,

The implementation team(Vendor) developed an interface between our ERP system and Fusion. The interface fetch the incremental data from ERP in dat file and zip's it and encrypt the zip file and uploads to Fusion.

Since the vendor left after implementing the fusion, we are trying to understand the interface. Sometime the interface doesn't work, as some of the employee changes is not reflected in the Fusion. So we are tried to manually create the dat file , zip it,encrypt it and uploads into Fusion.  

Now the issue is, we wanted to view the dat file which was created by interface to debug the issue. for example, Worker.zip . How we can decrypt the file to view the business object inside the zip file.