InstallShield installer archive

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File Format
Name InstallShield installer archive
Ontology
Extension(s) .ex_

InstallShield installer archive is what we're calling the format of the _INST32I.EX_ file included in many Windows software distributions that use the InstallShield installation software. It appears to be a general-purpose compressed archive format, though it's not clear whether it has been used in any other way.

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Disambiguation

It is not to be confused with InstallShield CAB, InstallShield Z, or MS-DOS installation compression.

Discussion

Based on unconfirmed information, the 16-bit SETUP.EXE program detects the user's platform, and extracts the appropriate platform-specific installer programs from _INST32I.EX_.

Identification

Files begin with bytes 2a ab 79 d8.

At offset 8 is the message "Copyright (c) 1990-1995 Stirling Technologies, Inc. All Rights Reserve".

Sample files

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