Here is this website – filext.com which provides details about different file extensions. If you are new to any file extension and want to know more about it, just visit this website and you will be loaded with the requisite knowledge.
FILExt is a database of file extensions and the various programs that use them. If you know the file extension you want to learn about simply enter it into the search box on the left and click on the Search button. If it’s in any of the FILExt databases the data we have on that file extension will be shown on a results page. If it’s not in any of the databases you will be given a link to a page with hints on how to do further research. Don’t search on terms; just file extensions and only one at a time please. There will be another search box on the results page if you have multiple searches to do.
Here I got this information after I searched for SIS extension –
| Extension: SIS |  |
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| Program and/or Extension Function [What’s This?] | Company [What’s This?] | |
| SymbianOS Installer File |  |
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| Specific Notes [What’s This?] | ||
| Application installation archive for most any device which uses the Symbian Operating System. | ||
| MIME Type [What’s This?] | File Classification [What’s This?] | Associated Links [What’s This?] |
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| Identifying Characters [What’s This?] | ||
| Hex (position 6): 00 10 19 04 00 10 | ||
| Program ID [What’s This?] | ||
| (None or Unknown) | ||
| General Notes [What’s This?] | ||
| (None) | ||
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This is record 11069 last modified on 2006-04-16.
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This is the extension of apps which I installed on my latest gadget.