Cannot find file that is in the SD card

Hello I am working on a project and my arduino cannot seem to find the file I am looking for even though it IS inside the SD card any help?

What kind of SD card ? Which Arduino board ? Which Arduino IDE version ? How did you format the SD card ? What is the name of the file ? Where is the sketch to open that file ? Can you open other files ?

I can ask many more questions, I'm just saying that we need a little more information. The Arduino is able to open a file, also if that file is in a folder.