Shutterstock tracks are 16bit (44.1khz or 48khz) WAV files. Comps are 128kbps (44.1 khz) MP3 files. Both are compatible with all major audio and video systems.
If you have issues with the track in your editing software, make sure that the audio settings in your project are set to be compatible with the sample rate and bit rate as the Shutterstock file. Alternatively, you convert the Shutterstock file to match the settings in your project.