First of all:
Wine which in this case may need to recreate something that mimics the runtime environment of a Windows command shell (cmd.exe).
As you have not told what
drive_c/Program\ Files\ \(x86\)/LINE/Line.exe is, there is no way to tell its requirements.
: ambiguous redirect1: 1 looks as a possible output from either Wine or cmd.exe.
May be you need to ensure that ONLY WINE is affected by the Linux style redirects. You may need to look into what Wine expects, and how to protect/separate its parameters from those caught by bash and vise versa.
Things to try:
As it works from the bash command prompt try
source line2 for starters.
If that works, maybe a try a variant like this - from a script:
wine /home/aiao/.wine/drive_c/Program\ Files\ (x86)/LINE/Line.exe > /dev/null 2>&1
start is a Windows command line tool that applies the same tasks as a double-click on e.g. a link or file, so try:
wine start /home/aiao/.wine/drive_c/Program\ Files\ \(x86\)/LINE/Line.exe
Note: WITHOUT the redirection, if that works to actually have the program run, then - if you still need it, you might try adding
>/dev/null 2>&1 (or whatever from the other answers) for Wine.