DEFLATE 1-2-3

File Format
Name	DEFLATE 1-2-3
Ontology	Electronic File Formats Compression DEFLATE 1-2-3 ; ; ;
Extension(s)	.?!?
Released	1989

Latest revision as of 11:56, 27 May 2026

DEFLATE 1-2-3 is a possible name for a compressed file format used for installation by some Lotus software.

It is not related to PKWARE's DEFLATE compression format, which it predates.

The compression utility, DEFLATE.EXE, calls itself "DEFLATE, the 1-2-3 file compression program".

The decompression utility, INFLATE.EXE, calls itself "INFLATE, the 1-2-3 file decompression program".

The compressed file has the same name as the original, except that the second character of the filename extension is replaced with "!".

The first byte of the compressed file is the filename character that was replaced. The compressed data immediately follows.

The compression scheme is a common form of LZW, like Zoo or EA archive, with a maximum code size of 12 bits.

[TODO]

INFLATE/DEFLATE (These utilities run on DOS, and probably OS/2.)
- INFLATE v2.0: smartpic.zip → {INFLATE.EXE, FLATE.RI}
- DEFLATE and INFLATE v2.0: [1] → {DEFLATE.EXE, INFLATE.EXE, FLATE.RI}
- INFLATE Symphony Release 2.2: [2] → {INFLATE.EXE, FLATE.RI}
Deark

(Look for files for which the second letter of the extension is "!".)

@@ Line 7: / Line 7: @@
 '''DEFLATE 1-2-3''' is a possible name for a compressed file format used for installation by some Lotus software.
-It is not related to the PKWARE's [[DEFLATE]] compression format, which it predates.
+It is not related to PKWARE's [[DEFLATE]] compression format, which it predates.
 The compression utility, DEFLATE.EXE, calls itself "DEFLATE, the 1-2-3 file compression program".
@@ Line 14: / Line 14: @@
 == Format details ==
-The compressed file has the same name as the original, except that the second character of the filename extesion is replace with "!".
+The compressed file has the same name as the original, except that the second character of the filename extension is replaced with "!".
 The first byte of the compressed file is the filename character that was replaced. The compressed data immediately follows.