wkhtmltoimage.exe is not a win32 valid application

Hello
When i start data assist pages (but also create security pages, insert new form, create email message ...) i get this message :
C:\Documents and Settings\Utilisateur\Application Data\Adobe\Dreamweaver CS6\en_US\Configuration\Shared\WebAssist\Library\Preview\wkhtmltoimage.exe n'est pas une application Win32 valide.
I already delete cs6 cache, delete data bindings extension and relodad it using adobe extension manager cs6 without any change.

Does that file exist in that directory? I'm wondering if the installer added it properly.

Ultimately that file is used to display the preview in the UI. It isn't necessary for functioning, so it could potentially be ignored.

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 -----
----------------------------------------------------------------------------------------
<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 ?

It should only be in WebAssist\Library\Preview.. you may have the wrong version of that file. I'll email you another version that could work better.