src/vs/workbench/contrib/extensions/browser/fileBasedRecommendations.ts/FileBasedRecommendations/addToPromptedFileExtensions
class FileBasedRecommendations:	private addToPromptedFileExtensions(fileExtension: string) {
		const promptedFileExtensions = this.getPromptedFileExtensions();
		promptedFileExtensions.push(fileExtension);
		this.storageService.store(promptedFileExtensionsStorageKey, JSON.stringify(distinct(promptedFileExtensions)), StorageScope.GLOBAL, StorageTarget.USER);
	}