src/vs/platform/userData/common/fileUserDataProvider.ts/FileUserDataProvider/copy
class FileUserDataProvider:	copy(from: URI, to: URI, opts: IFileOverwriteOptions): Promise<void> {
		if (hasFileFolderCopyCapability(this.fileSystemProvider)) {
			return this.fileSystemProvider.copy(this.toFileSystemResource(from), this.toFileSystemResource(to), opts);
		}
		throw new Error('copy not supported');
	}