How to enable zip adapter for different file extension?

[Rojetto]

I'm trying to search a bunch of files in a custom format, that is basically just a zip with a different extension. I've tried the following adapter configuration:

{
  "custom_adapters": [
    {
      "name": "piz",
      "version": 1,
      "description": "Reads PIZ files using the default zip adapter",
      "extensions": [
        "piz"
      ],
      "binary": "cat",
      "args": [
        "${input_virtual_path}"
      ],
      "disabled_by_default": false,
      "output_path_hint": "${input_virtual_path}.zip"
    }
  ]
}

My idea was that I can just pipe the file through and add a virtual .zip extension so that it gets passed to the zip adapter. However that results in this error:

path/file.piz: preprocessor command failed: '"/mnt/c/Users/username/dev/rga-preproc" "path/file.piz"':
-------------------------------------------------------------------------------
path/file.piz adapter: piz
path/file.piz.zip adapter: zip
Error: copying adapter output to stdout

Caused by:
    feature not supported: 'stream reading entries with data descriptors (planned to be reintroduced)'
-------------------------------------------------------------------------------

Is that the right approach? Any ideas what needs to be fixed? Thanks!