View source for QIP (Quarterdeck)

{{FormatInfo
|formattype=electronic
|subcat=Archiving
|extensions={{ext|qip}}
}}
'''QIP''' is a compressed archive format used by Quarterdeck for software installation. It was used by, for example, some versions of QEMM and DESQview. It uses [[PKWARE DCL Implode]] compression.

There are at least two versions of the format.

== Identification ==
Old format files start with ASCII "{{magic|QD}}", possibly always followed by bytes <code>00 00</code>, and probably always have <code>01 00</code> at offset 8. The first DCL Implode header is at offset 32; refer to [[PKWARE DCL Implode#Identification]].

New format files start with ASCII "{{magic|QP}}". Known files all have bytes {{magic|02 00 00 00 00 00 00 00}} at offset 8; the first byte or two of this might be a format version number. "<code>QD</code>" appears at the offset given by the 4-byte integer at offset 16.

== Software ==
* {{Deark}}

== Sample files ==
* [https://archive.org/details/QDPMI_ZIP QDPMI Host V1.0]
* {{CdTextfiles|simtel/simtel20/MSDOS/QTRDECK/QDPMI101.ZIP|QDPMI101.ZIP}}
* [https://archive.org/details/desqview26 DESQview/386 2.6]
* [https://archive.org/details/game-runner-2 GameRunner 3.0]
* [https://archive.org/details/QuarterdeckExpandedMemoryManager8.01German QEMM 8.01 (German)]
* [https://archive.org/details/qemm386-60-720k QEMM386 6.0] (old format)

== Links ==
* [[Wikipedia: Quarterdeck Office Systems]]