If you’re researching the history of organized naturist youth events (e.g., from the INF/FNI or national federations), I can instead help you find:
The specific file parameters you mentioned (57m duration, 352 x 240 resolution) are characteristic of Video CD (VCD) If you’re researching the history of organized naturist
Based on the file name, the technical specifications are as follows: "Nudist Youth Weekend" or "Naturist Youth Group" Production/Location: Helios Natura from the INF/FNI or national federations)