src/vs/platform/files/browser/htmlFileSystemProvider.ts/HTMLFileSystemProvider/capabilities
class HTMLFileSystemProvider:	get capabilities(): FileSystemProviderCapabilities {
		if (!this._capabilities) {
			this._capabilities =
				FileSystemProviderCapabilities.FileReadWrite |
				FileSystemProviderCapabilities.FileReadStream;

			if (isLinux) {
				this._capabilities |= FileSystemProviderCapabilities.PathCaseSensitive;
			}
		}

		return this._capabilities;
	}