here is htaccess
# override max php upload settings. Might not work on all servers
#php_value upload_max_filesize 4000M
#php_value post_max_size 4000M
# redirect www to non-www
#RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
#RewriteRule ^(.*)$ http://%1/$1 [R=301,L]
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} ^(.+)\~s$
RewriteRule ^(.*) stats.php?u=$1 [L]
RewriteCond %{REQUEST_URI} ^(.+)\~d$
RewriteRule ^(.*) delete_file.php?u=$1 [QSA,L]
RewriteCond %{REQUEST_URI} ^(.+)\~i$
RewriteRule ^(.*) share_file.php?u=$1 [QSA,L]
RewriteCond %{REQUEST_URI} ^(.+)\~f$
RewriteRule ^(.*) view_folder.php?f=$1 [QSA,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond $1 !\.html$
RewriteRule ^(.*) file_download.php?u=$1 [QSA,L]
RewriteRule ^(.*).html$ $1.php [QSA,L]
here is error report
10:04:07 86.3.86.4 "GET /check_host.php?=PHPE9568F35-D428-11d2-A769-00AA001ACF42 HTTP/1.0" 200 2146 "http://svfile.com/check_host.php" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.24 (KHTML
10:04:07 86.3.86.4 "GET /check_host.php HTTP/1.0" 200 81792 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.24 (KHTML
10:04:07 86.3.86.4 "GET /check_host.php?=PHPE9568F34-D428-11d2-A769-00AA001ACF42 HTTP/1.0" 200 2524 "http://svfile.com/check_host.php" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.24 (KHTML
10:04:01 46.185.51.4 "GET / HTTP/1.0" 200 79875 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0"
10:03:58 46.185.51.4 "GET /admin/ HTTP/1.0" 200 19940 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0"
10:03:35 46.185.51.4 "GET /check_host.php HTTP/1.0" 200 82498 "http://forum.mfscripts.com/viewtopic.php?f=8&t=447" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0"
10:03:35 46.185.51.4 "GET /check_host.php?=PHPE9568F34-D428-11d2-A769-00AA001ACF42 HTTP/1.0" 200 2524 "http://svfile.com/check_host.php" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0"
10:03:35 46.185.51.4 "GET /check_host.php?=PHPE9568F35-D428-11d2-A769-00AA001ACF42 HTTP/1.0" 200 2146 "http://svfile.com/check_host.php" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0"
10:00:53 86.3.86.4 "GET /check_host.php HTTP/1.0" 200 81720 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.24 (KHTML
10:00:53 86.3.86.4 "GET /check_host.php?=PHPE9568F34-D428-11d2-A769-00AA001ACF42 HTTP/1.0" 200 2524 "http://svfile.com/check_host.php" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.24 (KHTML
10:00:53 86.3.86.4 "GET /check_host.php?=PHPE9568F35-D428-11d2-A769-00AA001ACF42 HTTP/1.0" 200 2146 "http://svfile.com/check_host.php" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.24 (KHTML
09:48:13 86.3.86.4 "GET /favicon.ico HTTP/1.0" 200 1078 "http://svfile.com/check_host.php" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.24 (KHTML
09:48:13 86.3.86.4 "GET /check_host.php?=PHPE9568F35-D428-11d2-A769-00AA001ACF42 HTTP/1.0" 200 2146 "http://svfile.com/check_host.php" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.24 (KHTML
09:48:13 86.3.86.4 "GET /check_host.php?=PHPE9568F34-D428-11d2-A769-00AA001ACF42 HTTP/1.0" 200 2524 "http://svfile.com/check_host.php" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.24 (KHTML
09:48:12 86.3.86.4 "GET /check_host.php HTTP/1.0" 200 81425 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.24 (KHTML
09:40:00 46.185.51.4 "GET /check_host.php HTTP/1.0" 200 82498 "http://forum.mfscripts.com/viewtopic.php?f=8&t=447" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0"
09:40:00 46.185.51.4 "GET /check_host.php?=PHPE9568F34-D428-11d2-A769-00AA001ACF42 HTTP/1.0" 200 2524 "http://svfile.com/check_host.php" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0"
09:40:00 46.185.51.4 "GET /check_host.php?=PHPE9568F35-D428-11d2-A769-00AA001ACF42 HTTP/1.0" 200 2146 "http://svfile.com/check_host.php" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0"
09:38:47 46.185.51.4 "GET /check_host.php HTTP/1.0" 200 82146 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0"
09:38:47 46.185.51.4 "GET /check_host.php?=PHPE9568F34-D428-11d2-A769-00AA001ACF42 HTTP/1.0" 200 2524 "http://svfile.com/check_host.php" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0"
09:38:47 46.185.51.4 "GET /check_host.php?=PHPE9568F35-D428-11d2-A769-00AA001ACF42 HTTP/1.0" 200 2146 "http://svfile.com/check_host.php" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0"