WinRAR is a powerful archiver extractor tool, and can open all popular file formats. RAR and WinRAR are Windows 10 (TM) compatible; available in over 50 languages and in both 32-bit and 64-bit; compatible with several operating systems (OS), and it is the only compression software that can work with Unicode. WinRAR Download - Official WinRAR / RAR publisher. The compression tool that also supports ZIP, 7-Zip, Z, 7z, CAB, ARJ, LZH, TAR, Gzip, UUE, BZIP2 and ISO.

* WinRAR can create ZIP archives of practically any size. 2 GB archive size and 65535 file number ZIP limitations of previous WinRAR versions are not valid anymore.
* WinRAR can create multivolume ZIP archives, which are also known as split ZIP files. ZIP volumes have names like 'volname.zip', 'volname.z01', 'volname.z02'. Use a volume with '.zip' file extension in all archive processing operations like starting extraction or opening an archive. Unlike RAR volumes, ZIP volumes cannot be self-extracting. WinRAR needs to have access to all ZIP volumes of multivolume file set at the same time, when creating or unpacking them. So it is impossible to create or unpack ZIP volumes on removable disks, one volume per disk. You need to create them all in the same folder.
* Added the high precision file time support in ZIP archives. WinRAR can store and extract modification, creation and last access file time in ZIP archives with 100 nanosecond precision. You need to set 'High precision modification time' option in 'Time' part of archiving dialog to store all 3 times in archive. Set appropriate 'File time' options in 'Advanced' part of extraction dialog to choose times to extract.
* Added support for Unicode names stored in ZIP extra field data. Different ZIP tools store Unicode names either in file header or in ZIP extra field and now WinRAR can correctly process both types of Unicode names.
* 'Synchronize archive contents' option and -as command line switch are supported in ZIP format.
* Modifications of switch -ag behavior:
> -ag can be used with all RAR and WinRAR commands, not just with archiving only;
> 'N' format character behavior differs in archiving and non-archiving operations. When archiving, it is incremented until the first unused name is found. In non-archiving operations like extracting it selects the existing archive preceding the first unused name;
> 'I' format character allows to specify minutes regardless of presence and position of 'H' (hours) in format string. It can be used instead of 'M' (minutes), when you wish to place minutes before hours or do not need hours at all.
* By default, WinRAR proposes to update an archive if viewer modified an opened file or created any new files. New 'Ignore modifications for' option in 'Settings/Viewer' dialog allows to disable such behavior. You can enter one or several file masks separated by spaces here and WinRAR will not prompt to update an archive if file created or modified by viewer matches one of these masks.
* Changes in volume size input field. Now you can select size units in the drop down list to the right of volume size. Previous way to define size modifiers, by entering 'k', 'm', etc. character after the numeric size value, is also supported.
* Changes in 'Predefined sizes' in 'Define volume sizes' dialog. Floppies and ZIP disks are replaced by 5 MB and 100 MB volumes, added new entries for maximum FAT32 file size and for Blu-ray disks.
* New 'Wipe files if password is set' option in 'Options' page of archiving dialog. If you prefer to always delete encrypted files securely, you can enable 'Wipe files if password is set' in the default compression profile.
* New 'Wipe temporary files/Encrypted only' option in 'Settings/Security'. It allows to use a slower and more secure delete for temporary files extracted from archives identified by WinRAR as encrypted. Quick delete is used for all other temporary files.
* Changes in 'Convert archives' command:
> now it is possible to convert encrypted archives. Previously 'Convert archives' command skipped them. Though, if you still prefer to skip them, you can do it by enabling 'Skip encrypted archives' option in 'Convert archives' dialog. It might be useful if you wish to run the conversion command in unattended mode, avoiding password prompts;

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> special 'rar2' archive type, which was specific for RAR 1.x and 2.x archives, is removed. Now 'rar' archive type controls conversion of all versions of RAR archives. Since the convert command does not need to detect RAR archive version anymore, the initial search for archives is performed faster, resulting in shorter delay before displaying 'Convert archives' dialog.
* New -log[fmt][=name] switch allows to write archive and file names to log file in archiving command for RAR and ZIP formats and also in extracting, deleting and listing commands for RAR format. This switch is especially useful, when you need to further process an archive created with -ag or -v switches, because -log provides the archive name generated by WinRAR.
* New -@[+] switch allows to process all parameters starting from '@' character either as file names (-@) or as file lists (-@+).
* 'Setup program' SFX options are moved from 'General' to 'Setup' page of 'Advanced SFX options' dialog. Both 'Run after extraction' and 'Run before extraction' are now multiline, so it is possible to specify several setup programs for same SFX archive.
* 'SetupCode' SFX script command instructs SFX archive to wait for termination of setup program and return the exit code of setup program increased by 1000 as the exit code of SFX executable. GUI equivalent of this command is 'Wait and return exit code' option on 'Setup' page of 'Advanced SFX options' dialog.
* SFX does not support 'S' (create in the top level of Start Menu) 'Shortcut' command mode anymore. Recent Windows versions do not allow programs to add items to the top of Start Menu.
* Volume size in archiving and wizard dialogs can be specified as a decimal fraction. Decimal mark is defined by Windows regional settings. -v command line switch also allows decimal fractions. In command line mode the dot (.) is always used as the decimal mark. For example, -v1.5g switch means 1.5 gigabytes.
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x86 vs x64

The most important difference between x86 and x64 is that the former is the 32 bit architecture and the latter is the 64 bit instruction set architecture. An instruction set architecture (ISA) is a very important term that applies to any CPU. Instructions, memory addressing, registers, and many other architectural sections of a CPU are specified by the ISA. x86 is a world famous ISA introduced by Intel in 1978 with the 8086 processor. Then various extensions happened and, in 2000, AMD created the specification to extend the x86 instruction set to 64bit under the name AMD64. Later other companies such as Intel also implemented that specification and this AMD64 is the one that is identified by the name x64.

What is x86?

x86 is an instruction set architecture introduced by Intel with the famous 8086 processor. In 1978, Intel introduced the 8086 processor that was a 16 bit processor. Then later they introduced various processors such as 80186, 80286, 80386 and 80486, and all were backward compatible with the original instruction set used in the 8086 processor. Since all these processors end with the number 86, the instruction set architecture was identified by the name x86. With the introduction of 80386, the x86 instruction was extended to a 32bit system. Here, 32 bit means that all registers, memory bus, and data bus are 32 bit. Then Pentium processors came as Pentium I, Pentium II, Pentium III, Pentium IV and all these followed a 32 bit architecture as well. But various other extensions happened to the x86 architecture, such as addition of instructions like MMX, SSE and SSE2. Apart from that, many other improvements were also done. Then, the x86 instruction set was extended to a 64 bit instruction set and from this point onward it was called as x64, which we are going to discuss in the next section. Anyway, in general, x86 refers to the 32bit architecture that evolved from a 16bit architecture that came up with the 8086 processor.

What is x64?

A 32 bit system can represent only 2³² distinct values and, therefore, the memory addressing is limited to that number of addresses. 2³² bytes are equal to 4 GB and, therefore, x86 had a maximum addressable memory limit of 4 GB. In order to overcome this, further extensions were done to the x86 architecture. AMD, in around year 2000, introduced such specification that extended the x86 architecture to 64 bits. This was introduced under the name AMD64. x64 is another name given to this AMD64 architecture. This AMD64 or x64 architecture is also known under the name x86_64. With the 64 bit architecture, all registers became 64 bits and the memory bus and the data bus also became 64 bit. Now 2⁶⁴ distinct values can be addressed and this gives a huge upper limit on the possible maximum memory. AMD K8 was the first processor that implemented this 64 bit architecture. Then Intel also adopted this architecture. With Intel Core processors that started from Intel Core 2, Intel started using this architecture in their processors. Currently, all Intel processors such as Core i3, Core i5 and Core i7 use this x64 architecture. Some important thing to emphasize is that this x64 architecture is still backward compatible with the old x86 instruction set.

What is the difference between x86 and x64?

• x86 was introduced in around year 1978 while x64 came up more recently in year 2000.

• x86 emerged from the famous Intel 8086 processor and, therefore, x86 was introduced by Intel. But x64, which came as an extension to x86, was introduced by AMD.

• x86 architecture is 32bit. (First x86 processors were 16 bit but, in later processors, an extension to 32bit was done). x64 architecture is 64 bit.

• Processors with x86 instruction set architecture, therefore, has 32 bit registers, 32 bit memory bus, and 32 bit data bus. But x64 has 64 bit registers, 64 bit memory bus, and 64 bit data bus.

• x86 has a limitation on maximum addressable memory that is an upper limit of 4 GB ( 2³² bytes). But, on x64 systems, this limit is huge, which is 2⁶⁴ bytes.

• x64 is an expansion of x86; therefore, it is much improved and powerful than the old x86.

• Values that can be stored in a register, in a x64 system, is larger than a values that can be stored in a x86 based register. Therefore, x64 can handle computation of larger integers much faster, as there is no necessity to use several registers in such case to split the value and store as in x86.

• x64 can parallel transmit larger size data along the data bus. That is, a data bus of 64 bit can parallel transmit 64 bits while the x86 architecture that has a 32 bit bus can only parallel transmit 32 bits.

Summary:

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x86 vs x64

x86 instruction set architecture is 32 bit while x64 instruction set architecture is 64 bits. x64 came as an extension of the existing x86 architecture. The registers, memory bus, data bus on x86 architectures are 32 bits while this is 64 bits on x64. Therefore, the maximum amount of memory addressable is very much higher in x64 systems than in x86 systems. x86 was introduced by Intel with the 8086 processor that was a 16 bit processor and with the time this x86 was extended to 32 bit. Then later, AMD introduced the x64 architecture by extending the existing x86 architecture and this x64 is fully backward compatible with x86 instruction set.

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Images Courtesy:

1. Intel 8086 by Appaloosa (CC BY-SA 3.0)
2. 64 bit processor by Appaloosa (CC BY 3.0)