Many free IPTV lists are temporary and may stop working after a few days. The "25-DEC" date suggests this list may be several months old. Geo-Blocking: Some streams only work in specific countries.
Files containing channel lists are generally harmless text files, but you should always exercise caution: Download File 25-DEC-tv_channels_75916631090066...
If you load the file and the channels do not play, consider these common causes: Many free IPTV lists are temporary and may