shtml vs html

Is there a difference as far as search engines

[nan651]

With the latest google update my book reviews done with shtml have fallen to page three or four. The ones using html have remained at page one or two. Does using shtml penalize you in some way as far as the search engines are concerned?

[arrowman]

Does using shtml penalize you in some way as far as the search engines are concerned?

No, not usually.