Audio Video Interleave, Microsoft's classic RIFF video container.
| 0x00000000 | 52494646 | RIFF | RIFF container |
| 0x00000008 | 41564920 | AVI | 'AVI ' form type |
AVI is Microsoft's 1992 RIFF-based video container, still encountered in legacy captures and older camcorder footage. It opens with 'RIFF', a length, then the form type 'AVI '.
Have a file that might be AVI? Identify it with the File Type Identifier — it reads the magic number locally, nothing is uploaded. Or browse all formats.