I used both windows and android version and had no problem using one .m3u file under windows version. also, the file is also working with vlc and several other players.

under android, progtv (version 2.37.9) say (translate from french) "format not taken in account"
I had no problem with this m3u file with other players under android

the lines format look like :
#EXTINF:-1 channel-id=4 tvg-id="0004.ATV2.AT" tvg-name="0004.ATV2.AT" tvg-logo="ATV2.AT.png" group-title="Austria",0004.ATV2.AT
http://serveur.dns80/live/account/toto.ts
any special attributes ? should the file be in unix/windows/unicode/ansi format ? any restriction about file size ?
regards,

Please send me logs.

May be different user-agent?