When I call a simple script
<?
dl("mylib.dll");
?>
I received:
----
Warning: PHP Linter SQL Server extension: Unable to initialize module
Module compiled with debug=46, thread-safety=49 module API=0
PHP compiled with debug=0, thread-safety=1 module API=20000401 These options need to match in Unknown on line 0
----
My library has been built with new php header files(php 4.0.0) and 1-byte struct alignment

As I think the problem is with alignment
The tail of zend_module_entry is :
	int module_number;
	unsigned char zend_debug;
	unsigned char zts;
	unsigned int zend_api;

and if php4ts.dll is compiled with 4-byte alignment we'll have this problem

May be better to use such tail:
	int module_number;
	unsigned short zend_debug;
	unsigned short zts;
	unsigned int zend_api;
or
	int module_number;
	unsigned char zend_debug;
	unsigned char zts;
        unsigned char rez[2];
	unsigned int zend_api;

??