Thank you for your reply.
You'r right Ray,
This is the content of the folder C:\Documents and Settings\Utilisateur\Application Data\Adobe\Dreamweaver CS6\en_US\Configuration\Shared\WebAssist\Preview:
c:\Documents and Settings\Utilisateur\Application 551 110 2016-04-12 18:01 -----
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<images> <DIR> 2016-04-08 10:59 -----
<webassist> <DIR> 2016-04-08 10:59 -----
WAUE_HTML.htm 122 2016-04-10 11:02 -a---
wafb_Details_1267.html 1 950 2016-04-08 11:02 -a---
wafb_Details_3695.html 1 950 2016-04-08 11:02 -a---
wafb_Details_799.html 1 950 2016-04-08 11:04 -a---
wafb_Details_9463.html 1 905 2016-04-08 10:59 -a---
wafb_Results_6005.html 13 987 2016-04-08 11:04 -a---
wafb_Results_874.html 13 972 2016-04-08 10:59 -a---
wafb_Update_1616.html 2 211 2016-04-08 11:06 -a---
wafb_Update_6148.html 2 211 2016-04-08 11:05 -a---
wafb_Update_6821.html 2 211 2016-04-08 11:05 -a---
wafb_Update_7233.html 2 211 2016-04-08 11:05 -a---
On the other hand this folder C:\Documents and Settings\Utilisateur\Application Data\Adobe\Dreamweaver CS6\en_US\Configuration\Shared\WebAssist\Library\Preview includes the file:
c:\Documents and Settings\Utilisateur\Application 38 178 691 2016-04-08 10:28 -----
----------------------------------------------------------------------------------------
HtmlSnap2.dll 278 528 2016-01-14 12:31 -a---
libeay32.dll 1 177 600 2016-01-14 12:31 -a---
libgcc_s_dw2-1.dll 43 008 2016-01-14 12:31 -a---
mingwm10.dll 18 207 2016-01-14 12:31 -a---
ssleay32.dll 232 960 2016-01-14 12:31 -a---
HTML2Image.exe 147 456 2016-01-14 12:31 -a---
multiconv.exe 593 920 2016-01-14 10:58 -a---
SiteShoter.exe 76 288 2016-01-14 12:31 -a---
WebShot.exe 12 841 504 2016-01-14 12:31 -a---
wkhtmltoimage.exe 22 765 568 2016-01-14 10:58 -a---
_tx_.gif 43 2016-01-14 10:58 -a---
nopreview.gif 528 2016-01-14 10:58 -a---
openpreview.gif 711 2016-01-14 10:58 -a---
pleasewait.gif 688 2016-01-14 10:58 -a---
previewdisabled.gif 1 568 2016-01-14 10:58 -a---
Config.Ini 114 2016-01-14 12:31 -a---
Do i have to copy only wkhtmltoimage.exe from library/preview to preview or do i have to copy other files and which ones ?