Again this is another link to other information but this is mainly for my own reference. MSDN has a good search refence which lets you know the file extensions in MOSS search that are crawled out of the box and that have iFilter support out of the box. In Addition, it has a great listing of the protocol handlers that are supported out of the box and explains that weird “SPS” syntax you might see in your search crawl settings. Here is the MSDN article “Plan to crawl content”.
| File name extension | Default IFilter support | Default file type inclusions |
| ascx | Yes | Yes |
| asm | Yes | No |
| asp | Yes | Yes |
| aspx | Yes | Yes |
| bat | Yes | No |
| c | Yes | No |
| cmd | Yes | No |
| cpp | Yes | No |
| css | Yes | No |
| cxx | Yes | No |
| def | Yes | No |
| dic | Yes | No |
| doc | Yes | Yes |
| docm | Yes | Yes |
| docx | Yes | Yes |
| dot | Yes | Yes |
| eml | Yes | Yes |
| exch | No | Yes |
| h | Yes | No |
| hhc | Yes | No |
| hht | Yes | No |
| hpp | Yes | No |
| hta | Yes | No |
| htm | Yes | Yes |
| html | Yes | Yes |
| htw | Yes | No |
| htx | Yes | No |
| jhtml | No | Yes |
| jsp | No | Yes |
| lnk | Yes | No |
| mht | Yes | Yes |
| mhtml | Yes | Yes |
| mpx | Yes | No |
| msg | Yes | Yes |
| mspx | No | Yes |
| nsf | No | Yes |
| odc | Yes | Yes |
| one | No | No |
| php | No | Yes |
| pot | Yes | No |
| pps | Yes | No |
| ppt | Yes | Yes |
| pptm | Yes | Yes |
| pptx | Yes | Yes |
| pub | Yes | Yes |
| stm | Yes | No |
| tif | Yes | Yes |
| tiff | No | Yes |
| trf | Yes | No |
| txt | Yes | Yes |
| url | No | Yes |
| vdx | No | Yes |
| vsd | No | Yes |
| vss | No | Yes |
| vst | No | Yes |
| vsx | No | Yes |
| vtx | No | Yes |
| xlb | Yes | No |
| xlc | Yes | No |
| xls | Yes | Yes |
| xlsm | Yes | Yes |
| xlsx | Yes | Yes |
| xlt | Yes | No |
| xml | Yes | Yes |
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