Environment Variable in MSIX Using PSF

Abhi211 

In your example the executable is not defined correctly and the slashes are not escaped in the variable value. Here is an example that should work, but remember to add EnvVarFixup64.dll as TIMOTHY_MANGAN mentioned, but keep the json the same - "dll": "EnvVarFixup.dll"

{
  "applications": [
    {
      "id": "SevenZFM",
      "executable": "VFS\\ProgramFilesX64\\7-Zip\\7zFM.exe",
      "arguments": "",
      "workingDirectory": ""
    }
  ],
  "processes": [
    {
      "executable": ".*",
      "fixups": [
        {
          "dll": "EnvVarFixup.dll",
          "config": {
            "envVars": [
              {
                "name": "Z",
                "useregistry": "false",
                "value": "C:\\temp"
              }
            ]
          }
        }
      ]
    }
  ]
}