Studio One will load and play any common *.wav format file (and some other formats) so if your files aren't loading or playing they're either somehow corrupted of they're of an audio file format that Studio One doesn't support.
When or if you report things like this it's difficult to answer if you don't provide any relevant information like where the files where created and what format they are (wave, flac, or something else) or if they are of some bit format that some other workstation may export that Studio One may or may not support, like 64-bit floating point files.