Unable to open M2 maps from Pfhrenzy CD

[Deltau13]

Returns this unhandled exception

Unable to read beyond the end of the stream.
at System.IO.BinaryReader.ReadByte()
at BinaryReaderBE.ReadInt32()
at Weland.MapInfo.Load(BinaryReaderBE reader)
at Weland.Level.LoadChunk(ISerializableBE chunk, Byte[] data)
at Weland.Level.Load(DirectoryEntry wad)
at Weland.MapWindow.SelectLevel(Int32 n)
at Weland.MapWindow.OpenFile(String filename)
at Weland.MapWindow.OnOpen(Object obj, EventArgs args)

Tried multiple maps