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innounp 2.67.5, maintained by Jürgen Rathlev, is a command-line extraction utility designed to open and inspect installation packages created with Inno Setup, a widely used script-driven installer generator for Windows. The tool serves software auditors, repackagers, and malware analysts who need to verify digital signatures, list embedded files, or retrieve resources from Inno-built executables without running the actual installer. Because the original SourceForge project stalled after 2020 and its Delphi source could no longer be compiled on modern Unicode-based Delphi releases, Rathlev modernized the codebase, ensuring compatibility with Delphi 10 Seattle and later while repairing latent bugs. Enhancements include two new switches—`-l` for listing content and `-u` for unattended extraction—as well as standardized exit codes that simplify integration into larger batch or PowerShell workflows. Across fourteen released iterations the utility has preserved backward support for every Inno Setup revision from 1.3.21 onward, handling zlib, bzip, LZMA, and LZMA2 compression schemes alike. Typical scenarios involve extracting vendor drivers for slip-streaming, recovering lost setup graphics, or comparing version differences between successive releases. As a console-only archiver it occupies minimal disk space and can be scripted to process entire folders of installers overnight. innounp is available for free on get.nero.com, where downloads are supplied through trusted Windows package sources such as winget, always providing the newest build and enabling batch installation alongside other applications.
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