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If you couldn't find the extension you searched:

The list is permanently enhanced, revisit this site in a month or so.

LINKS

The most  important early sites in the 1990ths (besides Simtel which was at that time still owned by the US-Military as far as I remember) with tons of useful file informations were the finnish ftp servers x2ftp.oulu.fi (history here) and ftp://garbo.uwasa.fi (Timo Salmi's abandoning) (still exists, you only have to wait...) and ftp.funet.fi (still exists, you only have to wait...). Strangely enough these sites converted their content very late to the http:// protocoll that became more and more dominant from 1995 on. Most of the content of these sites exists today to my knowledge only partialy on mirrors. But it is always still worth to search for their content.

If someone should be interested in history: I still got many ls-LR.gz from 1989-2000. The net was very small then and easy to survey.

(Most universities and even countries were in the 1990ths only connected per 56Kbit/s.Seems I used a lot of their traffic contingent at that time...)

Wikipedia on file extensions

downloads:

Jouni's  list at Simtel (has grown considerably..)

Fred's french list

An Utility to Unassociate File Types in Windows 7 and Vista

If you need more in-depth information on file formats:

www.wotsit.org

graphics:

http://www.dcs.ed.ac.uk/home/mxr/gfx/

2-d formats on dcs.ed.ac.uk

image:

graphics formats page on file-ext.4uj.org

If you need to convert from one format to another:

http://irfanview.tuwien.ac.at/

Gohtm

pdf converter

3d-fileformat converter

3d fileformat converter

Many converters...

Select Extension by starting letter:

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V - W - X - Y - Z - OTHER - Allowed chars in file names - what is an extension?