I have faced a problem with german umlauts during mirroring of
<http://frankshospitalworkshop.com/equipment/x-ray_service_manuals.html>
Doing mirroring wrong files named "filename.htm.tmp" are created and when
mirroring ends those files are deleted.
After all in html wrong file nams appears:
D%fcrr_Regeneration_Unit_for_XR24_-_Installation_manual.html
instead of 
Dürr_Regeneration_Unit_for_XR24_-_Installation_manual.pdf

Message from the log file:
00:25:58	Error: 	"Not Found" (404) at link
www.frankshospitalworkshop.com/equipment/documents/x-ray/service_manuals/x-ray_film_processor/D&#1100;rr_XR24_-_Installation_manual.pdf
(from www.frankshospitalworkshop.com/equipment/x-ray_service_manuals.html)

Also I found when taking "Copy link location" on the original page and
inserting it in notepad/wordpad/MS Word the umlauts converts to a wrong one.

All posted solutions does not helps. 
I have tried German settings in Language for non-unicode programs (Region and
Language). No results here.
Iam using win 7st, FF 13.0.1 and httrack-3.46.1

Thank you in advance!