DEFLATE 1-2-3 - Revision history

Jsummers at 13:05, 1 June 2026

2026-06-01T13:05:03Z

Jsummers at 11:56, 27 May 2026

2026-05-27T11:56:20Z

Jsummers: Created page with "{{FormatInfo |formattype=electronic |subcat=Compression |extensions={{ext|?!?}} |released=1989 }} '''DEFLATE 1-2-3''' is a possible name for a compressed file format used for ..."

2026-05-27T11:40:43Z

Created page with "{{FormatInfo |formattype=electronic |subcat=Compression |extensions={{ext|?!?}} |released=1989 }} '''DEFLATE 1-2-3''' is a possible name for a compressed file format used for ..."

New page

{{FormatInfo
|formattype=electronic
|subcat=Compression
|extensions={{ext|?!?}}
|released=1989
}}
'''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.

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".

== 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 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.

== Identification ==
[TODO]

== Software ==
* INFLATE/DEFLATE (These utilities run on DOS, and probably OS/2.)
** INFLATE v2.0: {{CdTextfiles|swextrav1993/disk4/windows/smartpic.zip|smartpic.zip}} → {INFLATE.EXE, FLATE.RI}
** DEFLATE and INFLATE v2.0: [{{DiscMasterURL|browse/29628/ibm0100-0109/ibm0100.tar/ibm0100/IMPROV21.ZIP}}] → {DEFLATE.EXE, INFLATE.EXE, FLATE.RI}
** INFLATE Symphony Release 2.2: [{{DiscMasterURL|browse/33121/ibm0000-0009/ibm0001.tar/ibm0001/SYM22-2.ZIP}}] → {INFLATE.EXE, FLATE.RI}
* {{Deark}}

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

* See the packages in the Software section above.
* {{CdTextfiles|swextrav1993/disk4/windows1/fldemo1.zip|fldemo1.zip}} ...

[[Category:Lotus]]

@@ Line 21: / Line 21: @@
 == Identification ==
-[TODO]
+Realistically, good identification of the format requires that you either take the filename into account, or that you decompress at least part of the file to check for validity.
 == Software ==
@@ Line 31: / Line 49: @@
 == Sample files ==
-(Look for files for which the second letter of the extension is "!".)
+(Look for files for which the second character of the extension is "!".)
 * See the packages in the Software section above.

@@ 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.