Andrew Coltart shot a 6-under 66 to finish four shots back, along with Brian Davis, David Gilford, Marten Olander, Andrew Raitt and Steve Webster in a tie for fifth.
Jacquelin jumped out of the gate with a birdie at the first and added birdies and 6 and 8 to make the turn at minus-3. Despite the solid start, it wasn't until the inward half that 29-year-old caught fire.
The Frenchman birdied the 11th and picked up an eagle at the par-5 12th. He kept rolling with a birdie at the 13th and hit his tee shot to 15 feet for a birdie at the par-3 14th.
Jacquelin then knocked his approach inside 16 feet at the par-4 15th and drained the bending putt for another birdie.
He closed his round with a birdie at the last to match his career best on the European Tour.
Jacquelin had some extra incentive around the course as his girlfriend served as his caddie.
'My usual caddie had some things to do in Paris this week and had to stay there. I used his twin brother last week in Sweden and although he didn't make any mistakes, the feeling was not right,' said Jacquelin. 'Fanny wanted to try one week and we got together Tuesday and Wednesday in practice. It was fun today - 62 is a pretty good start.
'She is doing the job well. She has the yardage book and she wants to pace everything and help me read the lines of the putts. She follows me around every week so she knows a bit about the game and I think she did really well. It wasn't easy for the first time.'
Archer played the back side first and ran off four straight birdies to start his round. He then birdied three in a row starting at the par-4 16th to make the turn at 7-under.
The Englishman cooled off from that point on and parred his way in for a round of 65.
Local favorite Thomas Bjorn had a fast start with four birdies over his first eight holes before finding trouble with a bogey at the ninth.
Bjorn dropped another shot at the 11th and stumbled again with a bogey at the 13th. The Dane closed his round in style, however, with birdies on each of his last four holes for a round of 67.
Bjorn was joined by Peter Baker, Robert Karlsson, John Bickerton, Francois Delamontagne, Tobias Dier, Philip Golding, David Lynn, David Park, Greg Turner and Fredrik Widmark.
Colin Montgomerie, who is making his first appearance on tour since his withdrawal from the British Open due to a wrist injury, returned to action with three birdies and one bogey to finish in a group at 2-under-par 70.
'I have not putted at all well this year,' said Montgomerie. 'I don't know why. It's the same putter and the same person but they are not going in.'