I've built php and few modules using VC6++.
These modules can be loaded only in cgi mode (php.exe)  using dl() function.
DL function is not working in isapi mode since pl2 version.

I can't load them using my php4isapi.dll

The modules in my php.ini are :
 extension=php_oci8.dll
 extension=php_oracle.dll
 extension=php_exif.dll 
 extension=php_zlib.dll
 extension=php_calendar.dll
 extension=php_ftp.dll
 extension=php_imap.dll 
 extension=php_mssql70.dll