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All sets now have been retroactively assigned 3 letter codes. They are in parenthesis.
http://en.wikipedia.org/wiki/Magic:_The_Gathering_sets

The older 2 letter codes are listed first here because they are still in use by many programs,
such as Magic Workstation, that use the CCGHQ images.

Sets without codes in parenthesis are already correct, or don't have a code listed in the article above. Sloppy perhaps, but progress must be measured incrementally.

12 = Oversized (9x12)
4E (4ED) = Fourth Edition
4EA = Alternate Fourth Edition
5E (5ED) = Fifth Edition
6E (6ED) = Sixth (Classic) Edition
7E (7ED) = Seventh Edition
8E (8ED) = Eighth Edition
9E (9ED) = Ninth Edition
10E = Tenth Edition
A (LEA) = Limited Edition (Alpha)
AL (ALL) = Alliances
ALA = Shards of Alara
AN (ARN) = Arabian Nights
AP (APC) = Apocalypse
AQ (ATQ) = Antiquities
ARE = Arena
AS = Astral (Microprose)
AT (ATH) = Anthologies
B (LEB) = Limited Edition (Beta)
BD (BTD) = Beatdown
BOK = Betrayers of Kamigawa
BR (BRB) = Battle Royale
BT8 = Box Toppers 8E
BTP = Box Toppers Promo
CH (CHR) = Chronicles
CHA = Champs
CHK = Champions of Kamigawa
CS (CSP) = Coldsnap
CST = Coldsnap Theme Decks
DC = Dreamcast (Sega)
DIS = Dissension
DK (DRK) = The Dark
DM (DKM) = DeckMasters
DS (DST) = DarkSteel
EVE = Eventide
EVG = Duel Decks: Elves vs. Goblins
EX (EXO) = Exodus
FD (5DN) = Fifth Dawn
FE (FEM) = Fallen Empires
FI = Filler Cards
FNM = Friday Night Magic
FUT = Future Sight
GP (GPT) = GuildPact
GWY = Gateway
HL (HML) = Homelands
I2P = Introductory 2 Player, Kazz and Zakk
IA (ICE) = Ice Age
IN (INV) = Invasion
JSS = Junior Super Series
JU (JUD) = Judgment
JVC = Duel Decks: Jace vs. Chandra
LE (LGN) = Legions
LG (LEG) = Legends
LND = Lands
LRW = Lorwyn
MED = Masters Edition (MTGO)
MI (MIR) = Mirage
MOR = Morningtide
MM (MMQ) = Mercadian Masques
MR (MRD) = Mirrodin
NE (NMS) = Nemesis
OD (ODY) = Odyssey
ON (ONS) = Onslaught
OV = Oversized (6x9)
P2 (P02) = Portal: Second Age
P3 (PTK) = Portal: Three Kingdoms
PLC = Planar Chaos
PR = Promos
PRE = Preview
PS (PLS) = Planeshift
PT (POR) = Portal
PY (PCY) = Prophecy
R (3ED) = Revised (3rd) Edition
R1 = Renaissance (French)
R2 = Renaissance (Italian)
R3 = Renaissance (German)
RAV = Ravnica: City of Guilds
REW = Rewards
SC (SCG) = Scourge
SH (STH) = Stronghold
SHM = Shadowmoor
SM = Summer Magic
SOK = Saviors of Kamigawa
ST (S99) = Starter 1999
S2K (S00) = Starter 2000
TE (TMP) = Tempest
TK = Token Cards
TO (TOR) = Torment
TP = Test Prints
TSB = Time Spiral Timeshifted
TSP = Time Spiral
U (2ED) = Unlimited (2nd) Edition
UD (UDS) = Urza's Destiny
UG (UGL) = Unglued
UL (ULG) = Urza's Legacy
UNH = Unhinged
US (USG) = Urza's Saga
VG = Vanguard
VGM = Vanguard (MTGO)
VI (VIS) = Visions
WL (WTH) = Weatherlight
WP = Misprints-Wrong Pics

You have a better list.

12 = Oversized (9x12) (no HQ)
4E = Fourth Edition (no HQ) (MF)
4EA = Alternate Fourth Edition (no HQ) no crops (MF)
5E = Fifth Edition (MF)
6E = Sixth (Classic) Edition (no HQ) (MF)
7E = Seventh Edition (MF)
8E = Eighth Edition (MF)
9E = Ninth Edition (MF)
10E = Tenth Edition (MF)
A = Limited Edition (Alpha) (MF) no fulls
AL = Alliances (MF)
AN = Arabian Nights (MF)
AP = Apocalypse (MF)
AQ = Antiquities (MF)
ARE = Arena (MF)
AS = Astral (Microprose) (MF)
AT = Anthologies (MF)
B = Limited Edition (Beta) (MF)
BD = Beatdown (MF)
BOK = Betrayers of Kamigawa (MF)
BR = Battle Royale (MF)
BT8 = Box Toppers 8E no crops (MF)
BTP = Box Toppers Promo no crops (MF)
CH = Chronicles (MF)
CHA = Champs (MF)
CHK = Champions of Kamigawa (MF)
CS = Coldsnap (MF)
CST = Coldsnap Theme Decks (MF)
DC = Dreamcast (Sega) (MF)
DIS = Dissension (MF)
DK = The Dark (MF)
DM = DeckMasters (MF)
DS = DarkSteel (MF)
EX = Exodus (MF)
FD = Fifth Dawn (MF)
FE = Fallen Empires (MF)
FI = Filler Cards no crops (MF)
FNM = Friday Night Magic (MF) no crops
FUT = Future Sight (MF)
GP = GuildPact (MF)
GTW = Gateway (MF)
HL = Homelands (MF)
IA = Ice Age (MF)
IN = Invasion (MF)
JRE = Judge Rewards (no HQ)
JSS = Junior Super Series (MF)
JU = Judgment (MF)
LE = Legions (MF)
LG = Legends (MF) no fulls
LND = Alternate Art Lands (MF)
LRW = Lorwyn (MF)
MED = Masters Edition (MTGO) (MF)
MI = Mirage (MF)
MM = Mercadian Masques (MF)
MR = Mirrodin (MF)
MOR = Morningtide (MF)
MV = Multiverse (MF)
NE = Nemesis (MF)
OD = Odyssey (MF)
ON = Onslaught (MF)
OV = Oversized (6x9) (MF)
P2 = Portal: Second Age (no HQ) (MF)
P3 = Portal: Three Kingdoms (no HQ) (MF)
PLC = Planar Chaos (MF)
PR = Promos (MF)
PRE = Prerelease (MF)
PS = Planeshift (MF)
PT = Portal (no HQ) (MF)
PY = Prophecy (MF)
R = Revised (3rd) Edition (MF)
R1 = Renaissance (French) (MF)
R2 = Renaissance (Italian)
R3 = Renaissance (German) (MF)
RAV = Ravnica: City of Guilds (MF)
REL = Release
REW = Player Rewards (MF)
SC = Scourge (MF)
SH = Stronghold (MF)
SHM = Shadowmoor (MF)
SM = Summer Magic
SOK = Saviors of Kamigawa (MF)
ST = Starter 1999 (MF)
S2K = Starter 2000 (MF)
TE = Tempest (MF)
TK = Token Cards (MF)
TO = Torment (MF)
TP = Test Prints no crops (MF)
TSB = Time Spiral Timeshifted (MF) no fulls
TSP = Time Spiral (See links below)
U = Unlimited (2nd) Edition (MF)
UD = Urza's Destiny (MF)
UG = Unglued (MF)
UL = Urza's Legacy (MF)
UNH = Unhinged (MF)
US = Urza's Saga (MF)
VG = Vanguard (MF)
VGM = Vanguard (MTGO) (MF)
VI = Visions (MF)
WL = Weatherlight (MF)
WP = Misprints-Wrong Pics no crops (no HQ) (MF)


Two promo set codes had changed:

CHA = Champs -> CHP = Champs
JRE = Judge Rewards -> JGC = Judge Gift Cards

Cool. I took the list from the torrent and added the three letter codes. The one you posted is newer; I'll make sure the next torrent gets the more comprehensive list. I'll also make those two corrections.

Fixed. I also changed DeckMasters to Deckmasters, DarkSteel to Darksteel, etc.

Will there be a move to update the MWS DBs & CCGHQ folders to the 3-letter code?

No plans at the moment to change the older sets to 3 letter codes, maybe when the new MWS comes out.

Huggybaby wrote:No plans at the moment to change the older sets to 3 letter codes, maybe when the new MWS comes out.

A new MWS? Can you explain this better?

There's some big update Detonator has been working on for half a decade. Think Duke Nukem Forever.