Created attachment 150532 [details]
Example to reproduce the bug

assume you have UTF-8 coded sourcefiles like visual studio .NET files.

doxygen 1.6.1 generated tagfiles have the first line of a sourcefile parsed as a variable because it doesnt ignore the UTF-8 BOM at the beginning of the file. so it cant i.e. recognize using as a keyword.

However, including tagfiles in other projects seems to be broken. Therefor i cant see what he's doing with it.

important parts of the Configfile:

DOXYFILE_ENCODING      = UTF-8
EXTRACT_ALL            = YES

INPUT_ENCODING         = UTF-8

TAGFILES               = 
GENERATE_TAGFILE       = Tagfile
ALLEXTERNALS           = YES
EXTERNAL_GROUPS        = YES

--------------------------------------------------------------------------
tagfile

<?xml version='1.0' encoding='ISO-8859-1' standalone='yes' ?>
<tagfile>
  <compound kind="file">
    ...
    <member kind="variable">
      <type>using</type>
      <name>System</name>
      <anchorfile>_test1_8cs.html</anchorfile>
      <anchor>a81a223a02c34d82b47199f08308847f2</anchor>
      <arglist></arglist>
    </member>
    ...
</tagfile>