For some strange reason I am noticing that HTTrack is adding additional
characters to some (not all) of the file names.

Example: 
In certain folders <http://website/folder/index.php> has multiple html files
created by HTTrack as indexc714.html, indexfe94.html
But this is not universally true, in other folders index.php is just saved as
index.html

Why this discrepancy?The only thought that comes to mind is that in the former
case, the same index.php file is called from multiple pages with different
query-strings.

Is there a way to consistently always have just "index.html" without the
additional characters? I tried "Hide Query Strings" option but this does not
change the behavior.

Thanks in advance.