最近看ALTERA FPGA资料，遇到QAR文件，第一次遇到，网上查找得到如下：

1)        .qar   Quartus II Archive File

A compressed file (with the file extension .qar) that contains compressed versions of the Quartus II project files as they existed when they were archived. The Quartus II software automatically selects files to include in a QAR File, but you can rearrange, remove, or add files to the contents of a QAR File before you create it. A QAR File can include a project's design files, source files, and ancillary files, as well as system libraries. You can restore a QAR File multiple times.

layout-GRID-MODE: char; TEXT-ALIGN: left; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-pagination: widow-orphan" align=left>使用Quartus II自带的工程文件压缩功能可以省去取舍文件的麻烦。但是.qar文件把众多文件压缩成一个文件，只有解压缩才能获取具体文件的信息。如果使用版本控制工具（如CVS）的话，对.qar文件无法进行版本比较。甚至当.qar文件受损时，部分甚至全部文件都无法恢复了。而且，缺省配置的.qar文件也包含了一些非关键文件，存在一定的冗余。
    解决这一问题的关键在于弄清文件扩展名的意义，明明白白地控制文件的取舍。

The following file types are available for use in the Quartus II software:

Ahdl Include File
.inc
ATOM Netlist File
.atm
Block Design File
.bdf
Block Symbol File
.bsf
BSDL file
.bsd
Chain Description File
.cdf
Comma-Separated Value File
.csv
Component Declaration File
.cmp
Compressed Vector Waveform. File
.cvwf
Conversion Setup File
.cof
Cross-Reference File
.xrf
database files
.cdb, .hdb, .rdb, .tdb
dsp Block Region File
.macr
EDIF Input File
.edf, .edif, .edn
Global Clock File
.gclk
Graphic Design File
.gdf
HardCopy files
.datasheet, .sdo, .tcl, .vo
Hexadecimal (Intel-Format) File
.hex
Hexadecimal (Intel-Format) Output File
.hexout
HSPICE Simulation Deck File
.sp
HTML-Format Report File
.htm
I/O Pin State File
.ips
IBIS Output File
.ibs
In System Configuration File
.isc
Jam Byte Code File
.jbc
Jam File
.jam
JTAG Indirect Configuration File
.jic
Library Mapping File
.lmf
License File
license.dat
Logic Analyzer Interface File
.lai
Memory Initialization File
.mif
Memory Map File
.map
PartMiner edaXML-Format File
.xml
Pin-Out File
.pin
placement constraints file
.apc
Programmer Object File
.pof
programming files
.cdf, .cof
QMSG File
.qmsg
Quartus II Archive File
.qar
Quartus II Archive Log File
.qarlog
Quartus User-Defined Device File
.qud
Quartus II Default Settings File
.qdf
Quartus II Exported Partition File
.qxp
Quartus II Project File
.qpf
Quartus II Settings File
.qsf
Quartus II Workspace File
.qws
RAM Initialization File
.rif
Raw Binary File
.rbf
Raw Programming Data File
.rpd
Routing Constraints File
.rcf
Signal Activity File
.saf
SignalTap II File
.stp
Simulator Channel File
.scf
SRAM Object File
.sof
Standard Delay Format Output File
.sdo
Symbol File
.sym
Synopsys Design Constraints File
.sdc
Tab-Separated Value File
.txt
Tabular Text File
.ttf
Tcl Script. File
.tcl
Text Design File
.tdf
Text-Format Report File
.rpt
Text-Format Timing Summary File
.tan.summary
Timing Analysis Output File
.tao
Token File
ted.tok
Vector File
.vec
Vector Table Output File
.tbl
vector source files
.tbl, .vwf, .vec
Vector Waveform. File
.vwf
verilog Design File
.v, .vh, .verilog, .vlg
Verilog Output File
.vo
Verilog Quartus Mapping File
.vqm
Verilog Test Bench File
.vt
Value Change Dump File
.vcd
version-compatible database files
.atm, .hdbx, .rcf, .xml
VHDL Design File
.vhd, .vhdl
VHDL Output File
.vho
VHDL Test Bench File
.vht
XML files
.cof, .stp, .xml
waveform. files
.scf, .stp, .tbl, .vec, .vwf
上面这些文件可以分为五类：
    1. 编译必需的文件：设计文件（.gdf、.bdf、EDIF输入文件、.tdf、verilog设计文件、.vqm、.vt、VHDL设计文件、.vht）、存储器初始化文件（.mif、.rif、.hex）、配置文件（.qsf、.tcl）、工程文件（.qpf）。
    2. 编译过程中生成的中间文件（.eqn文件和db目录下的所有文件）
    3. 编译结束后生成的报告文件（.rpt、.qsmg等）
    4. 根据个人使用习惯生成的界面配置文件（.qws等）
    5. 编程文件（.sof、.pof、.ttf等）