Smil extension is related to RealMedia presentation file. You can try to open smil files with RealPlayer software.
SMIL extension stands for Synchronized Multimedia Integration Language. It is different type of presentation file like PowerPoint. It is similar to HTML files. You may find informations about texts, audios and videos in Smil files. Various type of cell phone brands can support Smil files. Such as 6600, 3560, S60.
To get detailed information about Real Player, please check the following link.
What to use SMIL
RealPlayer or Apple`s Quicktime
which page related to SMIL file
SMIL Related Searches
You can check related links about SMIL fileextension.