I doubt that having -w on the command line or not is the cause for Perl being unable to open the file. But Perl tells you why it couldn't open a file in the $! variable:

open(LOG, $file) or die ("\n\tPFAD/FILENAME FALSCH ? \n\nLogfile konnt
+e nicht geoeffnet werden: $!");    #$file öffnen
[download]

Some stylistic notes:

• Don't pass strings where you pass scalars:

  &Readinfo("$infofile");
  &Read("$file1");
  &Read("$file2");
  &Write("$file1");
  &Write("$file2");
  &Writeinfo("$infofile");
  [download]

  should be

  Readinfo($infofile);
  Read($file1);
  Read($file2);
  Write($file1);
  Write($file2);
  Writeinfo($infofile);
  [download]

  and

  index("$line","STEAM_0:",32)))
  [download]

  should be

  index($line,"STEAM_0:",32)))

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