Question: The Xar file format is from a company founded in what year?

Context paragraphs:
Xar (archiver): Xar (short for "eXtensible ARchive format") is an open source file archiver and the archiver’s file format.  It was created within the OpenDarwin project and is used in Mac OS X 10.5 for software installation routines, as well as browser extensions in Safari 5.0.  Xar replaced the use of gzipped pax files.

ShrinkIt: NuFX archive is an archive file format that supports lossless data compression that is given the file extension ". SHK".  A NuFX archive or . SHK file may contain one or more files or directories and with the extension . SDK even contains entire floppy disk images.  This format actually specified via the NuFX file format, was meant to replace and "Binary II" format back in the 1980s which had the . BNY or . BQY extensions... file envelopes with no compression.  The . SHK file format permits a number of compression algorithms.  This format was originally created in 1980s by Andy E. Nicholas and was first implemented within his ShrinkIt utility.

WAV: Waveform Audio File Format (WAVE, or more commonly known as WAV due to its filename extension) (rarely, Audio for Windows) is a Microsoft and IBM audio file format standard for storing an audio bitstream on PCs.  It is an application of the Resource Interchange File Format (RIFF) bitstream format method for storing data in "chunks", and thus is also close to the 8SVX and the AIFF format used on Amiga and Macintosh computers, respectively.  It is the main format used on Windows systems for raw and typically uncompressed audio.  The usual bitstream encoding is the linear pulse-code modulation (LPCM) format.

Xara: Xara is a UK-based software company founded in 1981.  It has developed software for a variety of computer platforms, in chronological order: the Acorn Atom, BBC Micro, Z88, Atari ST, Acorn Archimedes, Microsoft Windows and Linux.  It was originally called Computer Concepts, Ltd.; the company name was changed in 1995 to Xara, Ltd. and later to The Xara Group, Ltd.  On 30 January 2007, Xara was acquired by German company MAGIX AG, and now operates as a wholly owned subsidiary.

Xar (graphics): The Xar file format is the fully specified vector graphics file format of Xara and Xara Photo & Graphic Designer.

LBR (file format): The . LBR file format was an archive file format used on CP/M and DOS operating systems during the early 1980s.  . LBR files were created by the LU program; later programs like NULU arrived for . LBR creation, and many tools such as LT and QL were capable of extracting from . LBR archives.  . LBR is an abbreviation of "Library", and, resembling the . tar file format, member files were only stored in the . LBR file, not compressed.  As transfer of LBR files by modem was common, it was typical practice for archiving a collection of files to compress them using the SQ or CRUNCH programs then store them in an . LBR archive, or else (more rarely) store the files in the LBR archive, then use SQ or CRUNCH to compress the archive.  A compressed LBR archive file was given the extension ". LQR" (if squeezed) or ". LZR" (if crunched); however, it was more common to compress the members of the archive than to compress the archive as a whole.

EULUMDAT: EULUMDAT is a data file format used for specification of photometric data especially intensity distributions from light sources such as lamps and luminaries.  The file extension is . ldt.  The format was proposed by Axel Stockmar (Light Consult Inc., Berlin) in 1990.  The format is the European equivalent to the IES file format specified in IESNA LM-63.  The data in an EULUMDAT file is usually measured using a goniophotometer.  The IES file format is more formally specified and many measuring instruments

Spatial Data File (format): The Spatial Data File (SDF) is a single-user geodatabase file format developed by Autodesk.  The file format is the native spatial data storage format for Autodesk GIS programs MapGuide and AutoCAD Map 3D.  s of 2014 SDF format version SDF3 (based on SQLite3) uses a single file.  Prior versions of the format required a "spatial index file" (SIF), with an optional "key index file" (KIF) to speed access to the file.

OS/360 Object File Format: The OS/360 Object File Format is the standard object module file format for the IBM DOS/360, OS/360 and VM/370, Univac VS/9, and Fujitsu BS2000 mainframe operating systems.  In the 1990s, the format was given an extension with the XSD-type record for the MVS Operating System to support longer module names in the C Programming Language.  This format is still in use by the z/VSE operating system (the follow-on to the DOS/360 Operating System).  In contrast, it has been superseded by the GOFF file format on the MVS Operating System (the follow-on to the OS/360 Operating System) and on the z/VM Operating System (the follow-on to the VM/370 Operating System).  Since the MVS and z/VM loaders will still handle this older format, some compilers have chosen to continue to produce this format instead of the newer GOFF format.

Proprietary format: A proprietary format is a file format of a company, organization, or individual that contains data that is ordered and stored according to a particular encoding-scheme, designed by the company or organization to be secret, such that the decoding and interpretation of this stored data is only easily accomplished with particular software or hardware that the company itself has developed.  The specification of the data encoding format is not released, or underlies non-disclosure agreements.  A proprietary format can also be a file format whose encoding is in fact published, but is restricted through licences such that only the company itself or licencees may use it.  In contrast, an open format is a file format that is published and free to be used by everybody.

Supporting paragraphs: Xar (graphics) Xara
Answer: 1981