A .shw file is simply a text file. You can view and edit it with Notepad. Each item is surrounded with quotes and items are separated by commas.
Here's what the first part of the demo .shw file looks like (disregard the line wrapping, each cue should be on 1 line):
"StageConsole Version 1.6"
"24 chan demo show","3/20/2007 9:49:51 PM",24,16,""
"<CHANNEL_LABELS>"
"SR warm","CS warm","SL n/c","SR n/c","SL blue","CS blue","CS n/c","SR n/c","SL warm","SR blue","CS blue","SL n/c","Bk Center","Bk sides","Wash","House","Sp1","Sp2","19","20","21","22","23","24"
"<SUBMASTERS>"
"House only",300,0,0,0
"FullStage",200,0,0,0
"Intermission",27,0,0,0
"CenterStage",6,0,0,0
"Sub 5",0,0,0,0
"Sub 6",0,0,0,0
"Sub 7",0,0,0,0
"Sub 8",0,0,0,0
"Sub 9",0,0,0,0
"Sub 10",0,0,0,0
"Sub 11",0,0,0,0
"Sub 12",0,0,0,0
"Sub 13",0,0,0,0
"Sub 14",0,0,0,0
"Sub 15",0,0,0,0
"Sub 16",0,0,0,0
"<CUES>"
"1","10","0","66","0","0","0","0","58","0","0","0","0","0","0","0","0","0","","","","","","","","","Painting"
"2","1","100","100","100","100","100","100","100","100","100","100","100","100","51","50","40","0","","","","","","","","","Cocktail"
"3","1","0","0","0","0","32","0","0","0","0","0","0","0","0","0","0","0","","","","","","","","","B/O work"
"4","3","0","0","0","0","0","0","0","0","0","0","0","0","0","0","27","99","64","100","0","0","0","0","0","0","Test"