hmmm ... silly thought ...
but most providers do not allow the #exec and you cannot use it. (due to security limitations)
try #include instead ... that might work.
on the other hand if it would be a classic html the extension would be shtml to parse the include/exec.
If it was a UBB5 you would need to change the file extension to shtml or the server to parse html files too (and a higher systemload)
Dunno how the cgi extension handles this ... didn't check it.
Best Regards and good luck ...
Knuff