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ZIP files generally use the file extensions .mw-parser-output .monospacedfont-family:monospace,monospace.zip or .ZIP and the MIME media type application/zip. ZIP is used as a base file format by many programs, usually under a different name. When navigating a file system via a user interface, graphical icons representing ZIP files often appear as a document or other object prominently featuring a zipper.
WinZip, starting with version 12.1, uses the extension .zipx for ZIP files that use compression methods newer than DEFLATE; specifically, methods BZip, LZMA, PPMd, Jpeg and Wavpack. The last 2 are applied to appropriate file types when "Best method" compression is selected.
The File Explorer in Windows XP does not support ZIP64, but the Explorer in Windows Vista and later do. Likewise, some extension libraries support ZIP64, such as DotNetZip, QuaZIP and IO::Compress::Zip in Perl. Python's built-in zipfile supports it since 2.5 and defaults to it since 3.4. OpenJDK's built-in java.util.zip supports ZIP64 from version Java 7. Android Java API support ZIP64 since Android 6.0. Mac OS Sierra's Archive Utility notably does not support ZIP64, and can create corrupt archives when ZIP64 would be required. However, the ditto command shipped with Mac OS will unzip ZIP64 files. More recent[when?] versions of Mac OS ship with info-zip's zip and unzip command line tools which do support Zip64: to verify run zip -v and look for "ZIP64_SUPPORT".
A Seek-Optimized ZIP file (SOZip) profile  has been proposed for the ZIP format. Such file contains one or several Deflate-compressed files that are organized and annotated such that a SOZip-aware reader can perform very fast random access (seek) within a compressed file. SOZip makes it possible to access large compressed files directly from a .zip file without prior decompression. It combines the use of ZLib block flushs issued at regular interval with a hidden index file mapping offsets of the uncompressed file to offsets in the compressed stream. ZIP readers that are not aware of that extension can read a SOZip-enabled file normally and ignore the extended features that support efficient seek capability.
Some development libraries licensed under open source agreement are libzip, libarchive, and Info-ZIP. For Java: Java Platform, Standard Edition contains the package "java.util.zip" to handle standard .ZIP files; the Zip64File library specifically supports large files (larger than 4 GB) and treats .ZIP files using random access; and the Apache Ant tool contains a more complete implementation released under the Apache Software License.
The change history to the Rtools is below.Tools for 64 bit Windows buildsRtools 2.12 and later include both 32 bit and 64 bit tools.Most of the tools used for 32 bit builds work fine as well for 64 bit builds,but the gcc version may be different, and it has changed a number of times. R 3.3.0 and later use a toolchain based on gcc 4.9.3 and mingw-w64 v3, puttogether by Jeroen Ooms and others. See the project page for details. R-patched subsequent to Jan 22, 2012, R-devel, and releases after 2.14.1 used a toolchain based on pre-4.6.3 gcc, put together by Prof. Brian Ripley and available as multi.zip on his web page. Rtools 2.15 to 3.3 includes this toolchain. It uses the same gcc version for both 32 and 64 bit builds. Separate versions of the gdbdebugger are also included for each archtecture.Builds of R 2.13.x and R 2.14.0,1 used a release based on pre-4.5.2 gcc. Rtools 2.14 includesbinaries put together by Prof. Brian Ripley and available from his web page. To install these, select the "MinGW64" component when installing Rtools.For the later R 2.11.x versions, we used the MinGW-w64version based on pre-4.4.4 gcc from Prof. Ripley, which is no longer available.We also used this version for development builds of R 2.12.0 up to July 20.R 2.11.0 used -w64/files/Toolchains%20targetting%20Win64/Automated%20Builds/mingw-w64-1.0-bin_i686-mingw_20100322.zip, but this is apparently no longer availablefor download.To install any of these older versions, follow the instructions on Prof. Ripley's web page.DownloadsThere are a number of downloads described in the "Windows Toolset" appendix.
The iconv.zip internationalization library has beenupdated to version 1.11.The R_Tcl.zip files for Tcl/Tk support have been updated to version 8.4.13.mingw-runtime >= 3.10 is required to build R (a bug fix in the handingof MBCS code is required). This is enforced by a check in buildingRpwd.exe.Our daily builds no longer use the patched version of ld.exe, we use a newerversion of the unpatched utility. We have not tested the new setup on Windows NT4. If you are usingthat OS and the builds do not work, please let us know.Changes since R 2.2.1- The cmp utility is required to build R; a copy has been added to tools.zip [NB: tools.zip is no longer distributed].- There is a bug in the MinGW ld.exe linker utility version 2.16.91 20050827.This bug does not affect the linking method used in R up to 2.2.x, but is likely to affect the method usedin R 2.3.x or higher, making such builds fail to run on Windows NT 4 systems. Our dailybuilds are now using the patched version, but it is not included in the Rtools collection.See the instructions below to obtain and install a copy of the patched version. 041b061a72