Ikura GDL (archive)

Note: Because no extension is used on files, this was best way I could describe the format (referring to wiki page title).

Used in the following games:

• Amorous Professor Cherry
• Bazooka Cafe
• Cat Girl Alliance
• Chain
• Come See Me Tonight
• Crescendo
• Do You Like Horny Bunnies
• Family Project
• Figures of Happiness
• Heart de Roommate
• Hitomi -My Stepsister-
• Idols Galore
• I'm Gonna Nurse You
• Jewel Knights
• Let's Meow Meow
• Pick Me, Honey
• Private Nurse
• Sagara Family
• Secret Wives Club
• Slave Pageant
• Snow Sakura
• Tottemo Pheromone
• Tsukushite Agechau 4

Common file names:

• DATA
• GGD
• ISF
• MIDI
• SE
• VOICE, 1, 2
• WMSC

Uncommon file names:
(Trabulance Titles)

• TRGRP
• TRMSC
• TRSE
• TRSNR

(Kana -Little Sister-)

• DRSDAT
• DRSGRP
• DRSEF

Current Format

Header
Size	Content	Description
8Bytes	Magic/ID	SM2MPX10
4Bytes	File Count
4Bytes	Index Size
12Bytes	Archive Name
4Bytes	Unknown/Static?
Index Entry
Size	Content	Description
12Bytes	File Name	Unused space is filled with 0x00
4Bytes	Offset
4Bytes	File Size

Older Format

Header
Size	Content
2Bytes	Index Size
Index Entry
Size	Content
12Bytes	File Name
4Bytes	Offset?

Note1: There appears to be a second container format for this game engine. While these files have been seen to have used it in older titles. Even older ones have been seen to use only this format.

Note2: SM2MPX10

Note3: What is GamelexGS Inc? Is this a company that made or translated some of these early games? I've seen it show up on a few titles executable.