Now this will for pipe names that always start
with '\\.\pipe\' or '\\server\pipe\' and are longer
then 248 chars produce something like
\\?\UNC\.\pipe\... leading to ERROR_PATH_NOT_FOUND.
Further more GetFileAttributesW in apr_stat blocks for 30+
seconds leading to potential DoS attack.
The solution is to add "&& (srcstr != '.')" to the
upper check, but dunno if that would break something else