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.A File Extension


File Type Static Library
File Format File
Common? No
File Description Contains a library of functions and headers that may be referenced by a C/C++ source file; may contain only a few functions or may include an entire library of functions, such as a 3D modeling engine.

Using static libraries may result larger program files, but enables faster loading times compared to dynamic libraries.
Program(s) that open a files Mac / Windows: GNU C Compiler (GCC)
Unix: GNU C Compiler (GCC); Sun Studio C/C++ Compiler

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/a