IIS 7 Rewrite not support noescape|NE flag

Question

I am trying to install Vinilla forum using IIS 7.5. When I import .htaccess file I face the problem.

the origin .htaccess : RewriteEngine on RewriteRule ^([a-z]=.*) index.php?$1 [L,NE]

and iis tell it doesn't support NE flag.