| 缩写 | 全称 | 中文释义 |
|---|---|---|
| AD2 | ZFAX ADPCM 2-bit compressed voice file | zfax adpcm 2位压缩语音文件 |
| 75 | Ventura Publisher 75x75 dots per inch display font file | Ventura Publisher每英寸75x75点显示字体文件 |
| AC$ | Spooled plot file (AutoCAD AutoSpool) | 后台打印文件（autocad autospool） |
| ADPCM | Intel/ DVI Adaptive Differential Pulse Code Modulation Sound format | Intel/DVI自适应差分脉冲编码调制声音格式 |
| ABK | CorelDraw Automatic BacKup | coreldraw自动备份 |
| A8 | Cubicomp PictureMaker Alpha channel image data (24-bit 3D animation) | CubiComp PictureMaker Alpha通道图像数据（24位3D动画） |
| ACA | Project Manager Workbench Project file | 项目经理工作台项目文件 |
| AEXPK | PGP Armored EXtracted Public Key | PGP装甲拔出公钥 |
| 1ST | Usually README.1ST text | 通常为readme.1st文本 |
| AFM | Adobe Font Metrics (Type 1 font metrics for font installers) | Adobe字体度量（字体安装程序的类型1字体度量） |