GiB with 64-bit WinRAR. Special optional compression algorithms optimized for RGB bitmaps, raw audio files, Itanium executables, and plain text, which were supported by earlier versions, are supported only in the older RAR format, not RAR5. Optional optimized compression of x86 executables and delta compression (for structured table data) are supported in both file formats. 5.50 (2017-08): adds support for a master password which can be used to encrypt passwords stored in WinRAR. The default RAR format is changed to version 5. Adds support for decompressing Lzip archives; adds support for high precision file dates, longer file names and larger file sizes for TAR archives. 5.60 (2018-06): repairing of protected RAR5 archives was improved. Automatic detection of the encoding of ZIP archive comments. Recognition of GZIP files with arbitrary preceding data as an actual GZIP archive. 5.70 (2019-02): removes support for ACE archive decompression due to major security vulnerabilities in the unacev2.dll library. 6.00 (2020-12): "Ignore" and "Ignore All" options are added to read error prompt. "Ignore" allows to continue processing with already read file part only and "Ignore All" does it for all future read errors. 6.10 (2022-01): Dropped Windows XP support. Added support for unpacking ZST archives. Maximum recovery record is increased to 1000% of protected data size. 6.11 (2022-03): Support of Gzip archives with large archive comments has been added; In command line mode, the switch -mes can also be used to suppress the password prompt and abort when adding new files to an encrypted solid archive. 6.12 (2022-05): security vulnerability is fixed in Unix RAR versions. WinRAR and Android RAR are not affected. Operating systems support More recent versions do not support many older operating systems. Versions supporting older operating systems may still be available, but not maintained: RAR 2.50 (1999) is the last version that supports MS-DOS and OS/2 on 16-bit x86 CPUs (8086-compatible). RAR 3.93 is the last version for MS-DOS and OS/2 on IA-32 CPUs (80386 equivalents and later). It supports file names longer than the MS-DOS standard of 8.3 characters, in a Windows DOS box (except under Windows NT), and uses the RSX DPMI extender. WinRAR 2.06 is the last version to support Windows 3.1, Windows NT 3.1, Windows NT 3.5, Windows NT 3.51 and Win32s. WinRAR 3.93 is the last version to support Windows 95, 98, ME, and NT 4.0. RAR for Pocket PC 3.93 is the last version for Windows