各种文件的头文件标志
| 文件格式 | 头文件标识(16进制) |
| JPEG (jpg) | FF D8 FF E0 |
| PNG (png) | 89 50 4E 47 |
| GIF (gif) | 47 49 46 38 |
| BMP | 42 4D |
| TIFF (tif) | 49 49 2A 00 |
| CAD (dwg) | 41 43 31 30 |
| Photoshop (psd) | 38 42 50 53 |
| rtf | 7B 5C 72 74 66 |
| XML (xml) | 3C 3F 78 6D 6C |
| HTML (html) | 68 74 6D 6C 3E |
| Outlook Express (dbx) | CF AD 12 FE C5 FD 74 6F |
| Outlook (pst) | 21 42 44 4E |
| MS Access (mdb) | 53 74 61 6E 64 61 72 64 20 4A |
| 25 50 44 46 2D 31 2E | |
| Windows Password (pwl) | E3 82 85 96 |
| ZIP Archive (zip) | 50 4B 03 04 |
| RAR Archive (rar) | 52 61 72 21 |
| Wave (wav) | 57 41 56 45 |
| AVI (avi) | 41 56 49 20 |
| Real Audio (ram) | 2E 72 61 FD |
| Real Media (rm) | 2E 52 4D 46 |
| MPEG (mpg) | 000001BA |
| MPEG (mpg) | 000001B3 |
| Windows Media (asf) | 30 26 B2 75 8E 66 CF 11 |
| MIDI (mid) | 4D 54 68 64 |