You need no .t1 format string. Just store the t1 data directly.

Code:
void tick()
{
	T1* Ask = dataAppendRow(1,2);
	Ask->time = wdate();
	Ask->fVal = priceClose();
}

void click()
{
	dataSort(1);
	dataSave(1,strf("History\\%srec.t1",strx(Asset,"/","")));
	quit("Done!");
}

void run()
{
	BarPeriod = 1;
	LookBack = 0;
	panelSet(-1,-1,"Save");
}