In many instances of this specific encoding error, the original characters are likely Japanese Katakana or Hiragana. When these are forced through a Western European encoding, they break into the Cyrillic and mathematical symbols seen here.
and "01.mp4" remain intact because they are standard alphanumeric characters (ASCII), which are consistent across almost all encoding types.
: Records of media shared across borders often arrive with corrupted names due to regional software differences.