File Explorer - Preview Pane - Add support for custom file extensions

Description of the new feature / enhancement

I'd like to introduce the possibility to add custom file extension to this list:

PowerShell files (.ps1) and Linux Shell filer (.sh) are supported by this tool, but their extension is not present in this list, it would be useful to see every working extension: (A list is not even available in the Documentation)

Batch files (.bat) have the default windows preview (white background with black text) and I'd like to be able to change it to the default Monaco style.

Git files, like .gitignore and .gitattributes, have their preview if you have git installed (also black on white, and I'd like to override this too)

This also applies to other formats I often would like to read without opening them, like:

.lock,
.env
.uproject
.uplugin

It would be really useful to have the possibility to add custom extensions and treat them as regular .txt files (I don't really care about having fancy colors, but that would be a plus)

Scenario when this would be used?

To preview files with custom extensions that could be easily supported "out of the box" but they are not recognized by the tool

Supporting information

In my specific case, as an Unreal Engine dev, it would be really useful to preview project and plugin files, that have the following syntax:

.uproject file:

{
    "FileVersion": 3,
    "EngineAssociation": "{F606ED38-477B-4BEB-D8C5-D588318C83C6}",
    "Category": "",
    "Description": "",
    "Modules": [
        {
            "Name": "UnrealProject",
            "Type": "Runtime",
            "LoadingPhase": "Default",
            "AdditionalDependencies": [
                "Engine",
                "CoreUObject"
            ]
        }
    ]
}

.uplugin file:

{
    "FileVersion": 3,
    "Version": 1,
    "VersionName": "1.0",
    "Description": "Mongocxx Library",
    "Category": "Database",
    "CreatedBy": "Ares9323",
    "CreatedByURL": "",
    "MarketplaceURL": "",
    "SupportURL": "",
    "EngineVersion": "4.27.0",
    "CanContainContent": false,
    "Installed": true,
    "Modules": [
        {
            "Name": "MongoDB",
            "Type": "Runtime",
            "LoadingPhase": "EarliestPossible",
            "PlatformAllowList": [
                "Win64"
            ],
            "WhitelistPlatforms" :
            [
                "Win32",
                "Win64"
            ]
        }
    ]
}

microsoft / PowerToys