How to do error checking on afFile or aqTextFile methods

It depends a lot upon the methods you are using.  The first thing I'd start with is to wrap them with "try/catch/finally" logic to trap anything unexpected.  You are correct, the documentation shows "happy path" but all that is intended to show is "usage", not good coding practices. 

Do you have a specific code example of what you want to mitigate?

Hi,

I had kind of same scenario, I use below code to do that.

function test()
{
      CheckFile("C:\\Test\\Test.txt");
} 
function CheckFile(pathofthefile)
{
      if(aqFile.Exists(pathofthefile)) //Or if(aqFileSystem.Exists(pathofthefile))
      {
            Log.Checkpoint("File exists in the path " + pathofthefile);
            
            var txtFile = aqFile.OpenTextFile(pathofthefile,aqFile.faRead, aqFile.ctUnicode);
            
            try
            {
                  if(txtFile.LinesCount > 0)
                  {
                        Log.Checkpoint("Text file contains " + txtFile.LinesCount + " lines");    
                        return true; 
                  } 
                  else
                  {
                        Log.Warning("Text file is empty");
                  } 
            }
            catch(e)
            {
                  Log.Error("Unexpected error : "  + e.stack);
            } 
                
      } 
      else
      {
            Log.Error(pathofthefile + " file not exists")
      } 
      return false;
}