The string "X26" strongly suggests or H.265 (HEVC) . Use MediaInfo (free tool) to analyze the file. It will tell you the true video codec, audio codec, bitrate, and whether the file is complete.
: These are random or garbled character strings (gibberish) frequently generated by automated bots or encoding errors. -HDToonsPlay- Snc Th Hd9h9 2020 X26...
If you can provide even one additional clue—such as the actual file extension, the file size, or where you encountered the term—more specific guidance can be offered. Until then, consider the case closed: the string is noise, but your path to safe, HD cartoon playback is clear. The string "X26" strongly suggests or H