Mongodb extension problem

hi. I am a windows8.1 x64 user and a php developer. I’ve tried to add php_mongodb.dll to php but I get “dynamic library could’nt be fount”. although I’ve added the dll to ext directory and php.ini as well. the php --ini command is doing well and shows my ini file. and I use php 7.4 nts(nonthreadsafe). abd also my dll address is right. php/ext directory is right. i’ve installed mongodb correctly and it works without any proble. but the dll I don’t know what’s wrong with it.