It is possible to archive both data and executable files with self-extracting archives. One of the early examples of self-extracting archives is the Unix shar archive, which combined a number of text files into a shell script that recreated their original content after being executed.
Others (like 7-Zip or RAR) can create self-extracting archives as regular executables in ELF format. There are also programs that create self-extracting archives on Unix as shell scripts, which utilize programs like tar and gzip (which must be present in the destination system). Macintosh users may choose StuffIt, The Unarchiver, or 7zX as their archivers. Among the Windows archivers are WinZip, WinRAR, 7-Zip, WinUHA, KGB Archiver, Make SFX, the built-in IExpress wizard and many others, some experimental. Several programs can create self-extracting archives. If you compare a LZMA 7z archive to a LZMA2 7z archive, for example, the decompression routines will differ
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Depending on the options used to create a self-extracting archive, the executable code placed at the beginning may vary. Decompression utilities must be able to handle both the file format and the algorithm used when expanding self-extracting or standard archives. A single file format, such as 7z, can support multiple different compression algorithms including LZMA, LZMA2, PPMd and BZip2. Additionally, there is a distinction between the file format and the compression algorithm. Many programs can handle multiple types of archives, whereas others can create, extract, or modify only one type. There are several functionally equivalent but incompatible archive file formats, including ZIP, RAR, 7z and many others.
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This works for ZIP archives due to the way the ZIP header is defined, but not necessarily for other less flexible archive format. Files that are not recognized as archives by archive managers due to their executable extension can be renamed into. It will not self-extract under Linux, but can be opened with a suitable archive manager. It may also be converted into somefiles.exe, which will self-extract under Microsoft Windows.
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exe extension, just like any other executable file.įor example, an archive may be called somefiles.zip - it can be opened under any operating system by a suitable archive manager which supports both the file format and compression algorithm used. Typically, self-extracting files have an. The self-extracting executable may need to be renamed to contain a file extension associated with the corresponding packer archive file formats known to support this include ARJ and ZIP. While self-extracting archives cannot be extracted under another operating system, they can usually still be opened using a suitable extractor as this tool will disregard the executable part of the file and extract only the archive resource. Unlike self-extracting archives, non-self-extracting archives only contain archived files and must be extracted with a program that is compatible with them. Many embedded self-extractors support a number of command line arguments, such as specifying the target location or selecting only specific files. By using a file archiver, users can view or decompress self-extracting files they received without running executable code (for example, if they are concerned about viruses).Ī self-extracting archive is extracted and stored on a disk when executed under an operating system that supports it. However, file archivers like WinRAR can still treat self-extracting files as any other compressed files. Such a compressed file does not require an external program to decompress the contents of the self-extracting file, and it can run the operation itself. Self-extracting archives contains an executable file module, a module used to run uncompressed files from compressed files.
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