In franks post, the first picture shows 2 gauntlets in the top left, the furthest left is a gauntlet, the right one is a spiked gauntlet. They are both the same, except small spikes are not put on the gauntlet enabling leathal damage AND making it an armed attack
The basic flexability of the gauntlet is the same, so to a trained warrior (one who can wield all wepaons, and wear all armour) it would be perfectly feasable for him to wear spiked gauntlets and use a weapon.
If however, your gauntlets were spiked like the seocnd picture (is that shredder?) then I would rule you cant wear them and wield a weapon, as the claws would hinder the free movement of the weapon. Also, gauntlets similar to the second picture were also in the Sword and Fist source book as an exotic weapon, doing something like 1d6 (17-20x2) they were quite ridiculous in the hands (pardon the pun) of a warrior.
As for the rules, spiked gauntlets appear in the armour table, and as putting spikes on your armour makes your amrour into a weapon for grapples, its still armour.
So as the spiked gauntlet appears in the armour list as well as the weapons list, it is perfectly feasible to wear spiked gauntlets AND wield a weapon. But not claws I think.
Feegle Out
