You may see a CM0013 file if using a storage device with a Samsung Smart TV. Your files disappear and only the CM0013 file appears when you disconnect the storage device and connect it to your computer. Reconnecting the storage device to the TV may restore your files. CM0013 files are not malicious. CM0013 is an index of files saved on the connected storage device. It contains text detailing the name and location of each file. Programs that open CM0013 files include NotePad++. NotePad++ supports text files like CM0013. More software programs support the CM0013 file extension. Tips are provided on opening CM0013 files. A list of programs supporting CM0013 files is also given. The CM0013 file extension is usually associated with Samsung Smart TVs. Specialized software is typically required to open CM0013 files. Converting CM0013 files may be difficult due to their proprietary format.