src/vs/workbench/services/dialogs/browser/simpleFileDialog.ts/SimpleFileDialog/filterFile
class SimpleFileDialog:	private filterFile(file: URI): boolean {
		if (this.options.filters) {
			const ext = resources.extname(file);
			for (let i = 0; i < this.options.filters.length; i++) {
				for (let j = 0; j < this.options.filters[i].extensions.length; j++) {
					const testExt = this.options.filters[i].extensions[j];
					if ((testExt === '*') || (ext === ('.' + testExt))) {
						return true;
					}
				}
			}
			return false;
		}
		return true;
	}