fileIn := A_Desktop "\input.txt"
fileOut := A_Desktop "\output.txt"

out := ""
Loop, Read, % fileIn
{
    RegExMatch(A_LoopReadLine, " ?{.+} ?", match)
    out .= StrReplace(A_LoopReadLine, match, " ") "`r`n"
}
FileOpen(fileOut, "w").Write(out).Close()