I checked it in my BG1 item-folder :
sw1h means one-handed-sword instead of sw2h, which means two-handed-sword Â
my list of one-handed swords goes from sw1h01 to sw1h17. Â than there is a huge gap and than there are the swords
sw1h98 and sw1h99.
If you compare this item list of BG1 Â
http://db.gamefaqs.com/computer/doswin/file/baldurs_gate_items.txt   :
SW1H01 - Bastard Sword
SW1H02 - Bastard Sword +1
SW1H03 - Bastard Sword +1, Shapeshifters
SW1H04 - Long Sword
SW1H05 - Long Sword +1
SW1H06 - Long Sword +2
SW1H07 - Short Sword
SW1H08 - Short Sword +1
SW1H09 - Short Sword +2
SW1H10 - Short Sword of Backstabbing
SW1H13 - Moonblade
SW1H15 - Scimitar +3, Frostbrand
SW2H01 - Two Handed Sword
SW2H02 - Two Handed Sword +1
SW2H03 - Two Handed Sword, Berserking
SW2H06 - Spider's Bane
and this item list of BG1 with TotSC  http://db.gamefaqs.com/computer/doswin/file/baldurs_gate_c.txt     :
ONE HANDED SWORDS:
   SW1H01 - Bastard Sword
   SW1H02 - Bastard Sword +1
   SW1H03 - Bastard Sword +1, Shapeshifters
   SW1H04 - Long Sword
   SW1H05 - Long Sword +1
   SW1H06 - Long Sword +2
   SW1H07 - Short Sword
   SW1H08 - Short Sword +1
   SW1H09 - Short Sword +2
   SW1H10 - Short Sword of Backstabbing
   SW1H11 - Odd Flame Sword (Creature Attack?)
   SW1H12 - Hull's Long Sword
   SW1H13 - Moonblade
   SW1H14 - Short Sword +1
   SW1H15 - Scimitar +3, Frostbrand
   SW1H16 - Scimitar +5, Defender
   SW1H17 - Perdue's Short Sword
   SW1H18 - Sword of Balduran
   SW1H19 - The Vampire's Revenge (cursed)
   SW1H20 - Scimitar
   SW1H21 - Short Sword
   SW1H22 - Scimitar +1
   SW1H23 - Scimitar +2
   SW1H24 - Long Sword +1, Flame Tongue
   TWO HANDED SWORDS:
   SW2H01 - Two Handed Sword
   SW2H02 - Two Handed Sword +1
   SW2H03 - Two Handed Sword, Berserking
   SW2H05 - Two Handed Sword (no image)
   SW2H06 - Spider's Bane
   SW2H07 - Two Handed Sword +3
   SW2H08 - Two Handed sword +2
I think you will see, that sw1h18 to sw1h24 are swords of TotSC. (the one-handed swords 11,12,14,16 and 17 could be in the latest official BG1 patch perhaps, beacause I have them too, allthough I haven't TotSC) but I'm not really sure. I hope this can help you