| Microsoft DirectX 8.1 (C++) | 
The Async File Source filter opens and reads local files of many different data formats and passes the data to a parser filter.
For downloading data from the Web, use the File Source (URL) filter. To read ASF files, use the ASF Reader filter.
| Filter Interfaces | IBaseFilter, IFileSourceFilter | 
| Input Pin Media Types | Not applicable. | 
| Input Pin Interfaces | Not applicable. | 
| Output Pin Media Types | MEDIATYPE_Stream. The subtype depends on the media format. (MEDIASUBTYPE_NULL if the filter doesn’t recognize the format.) | 
| Output Pin Interfaces | IAsyncReader | 
| Filter CLSID | CLSID_AsyncReader | 
| Property Page CLSID | No property page. | 
| Executable | quartz.dll | 
| Merit | MERIT_UNLIKELY | 
| Filter Category | CLSID_LegacyAmFilterCategory |