Wiles scored his first goal since signing from Blackpool
Two goals within three minutes gave Dunfermline victory over Scottish Premier League outfit St Mirren in the Co-operative Insurance Cup.
The visitors had been the biggest threat during a fairly even first half, with former Pars strikers Jim Hamilton and Billy Mehmet going close.
But Graham Bayne headed home after a 68th-minute Scott Thomson free-kick.
And substitute Simon Wiles provided the finish after being set up by Kevin Harper for the Division One side.
Former Blackpool midfielder Wiles' first goal since joining the Pars during the summer took Dunfermline into the quarter-finals at the expense of a top-tier outfit who looked well beaten in the final stages.
And it meant that Hamilton, Mehmet, John Potter, Gary Mason and manager Gus MacPherson all endured defeat against their former club.
Pars manager Jim McIntyre was up against MacPherson, his former Kilmarnock team-mate who tried to sign him last season, but those elements of added spice failed to lift the match above the bland in the first half.
St Mirren, who were missing key midfielder Andy Dorman, caused problems early on with high balls and some efforts from long range, while Hamilton looped a header on to the roof of the net from Jack Ross' cross.
Scott Wilson's excellent goalmouth challenge stopped Hamilton converting a Franco Miranda cross before Greg Shields forced Mehmet to fire wide from the loose ball.
Both sides attacked with more purpose after the restart and the visitors carved out a half-chance when Mehmet laid the ball off for Hamilton to shoot just over from 20 yards.
Buddies goalkeeper Mark Howard saved comfortably from Andy Kirk's shot on the turn before setting up a chance for Hamilton, which produced the game's first moment of controversy.
Bayne (left) opened the scoring at East End Park
The striker ran on to a long kick-out that sailed straight over the home defence before Shields slid in.
The defender appeared to get something on the ball and then brought down Hamilton, with referee Calum Murray waving play on.
Both sides were passing the ball around with pace and Kirk struck the top of the bar from 20 yards following a great piece of skill to turn Ross.
The Pars did net in the 69th minute when Bayne rose 16 yards out to guide a difficult header into the top corner following Harper's cross.
St Mirren tried to hit back and Mehmet glanced a header wide from Stephen McGinn's corner, but their hopes drifted away when substitute Wiles lashed the ball in off the bar after Kirk had knocked Harper's corner back across goal.
Buddies substitute Steven Robb volleyed over from 12 yards after running on to Miranda's cross, but the visitors rarely threatened a comeback and were subjected to jeers from their supporters.
Dunfermline manager Jim McIntyre: "I thought Simon Wiles gave us a wee lift.
"He injected a bit of pace, which was much needed, and popped up with a goal.
"It was a good team performance. The defence was excellent and the midfield worked their socks off. And what a header from Graham Bayne."
St Mirren manager Gus MacPherson: "The second half was shocking. We were reasonably comfortable first half. But the second half...
"Sometimes you ask questions and don't get answers. There were a couple of balls into the box and we didn't deal with them.
"I thought, from where we were, there was certainly contact when Jim Hamilton went through.
"I asked the linesman and he said there was no contact with the ball.
"But we're not going to blame anybody apart from ourselves for a second-half performance like that."
Dunfermline: Gallacher, Scott Thomson, Wilson, Phinn, McCann, Shields, Bell (Wiles 68), Burke, Harper (Woods 80), Kirk, Bayne. Subs Not Used: Muirhead, Lee, Reidford.
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