If you have a problem when setting PHP extension via GUI.  Try the step below.
- Check the PHP ini.
- In front of the module that need to load should not have semicolon (;) 
  e.g. ;extension=php_mcrypt.dll => extension=php_mcrypt.dll 
- Also, you need to add "extension" line at the end of all extensions.
  e.g.
;extension=php_xmlrpc.dll
;extension=php_xsl.dll
;extension=php_zip.dll
extension=php_curl.dll
extension=php_mcrypt.dll
extension=php_mcrypt_filter.dll
Hope it will works. 
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