My app embeds a webbrowser control. One issue I notice after installing IE7 is that if I browse directly to a SWF or PDF in the webbrowser control, the page is blank. If I browse to an html page that embeds a SWF, it works fine. Browsing directly to a SWF or PDF in my embedded webbrowser control works fine in IE6. Am I missing a flag/setting when creating my webbrowser control

BTW - I'm using WinXP SP2. If I browse to the SWF or PDF in standalone IE7, it works fine.

Jake-

A KB article is coming out shortly about this issue. However, here's the short version:

This error is occurring because of an unforeseen dependency between an IE6 XPSP2 security feature (Local Machine Zone Lockdown) and a new IE7 security feature designed to protect users from improper cross-domain access to their local file system. Until the dependency is corrected, users may correct the problem through one of two possible workarounds (below).

Workaround:

Two options are available¡ªeach option has a potential side-effect. The first option is to opt-in the 3^rd party application into the Local Machine Zone Lockdown feature control key. This is the recommended option. It allows the 3^rd party application experiencing the problem to be more secure by tightening restrictions on several URL actions that make the local file system zone more protected than the Internet Zone (this has potential compatibility implications). Users should read Compatibility in IE6 for Windows XP SP2 under the section Local Machine Zone Lockdown, for more information.

To opt-in to Local Machine Zone Lockdown:

1. Click ¡°Start¡±, ¡°Run¡±.

2. Enter ¡°regedit¡±

3. Find and select the following registry entry:
HKEY_LOCAL_MACHINE
SOFTWARE
Microsoft
Internet Explorer
MAIN
FeatureControl
FEATURE_LOCALMACHINE_LOCKDOWN

4. Click ¡°Edit¡±, ¡°New¡±, and ¡°DWORD¡±

5. The name should be set to the process name of the application experiencing the problem. For example, if the application is mybrowser.exe, then enter ¡°mybrowser.exe¡± (without the quotes)

6. The Value (double-click on the newly created entry) should be set to ¡°1¡± (this opts the process into this feature, enabling the workaround)

7. Close the Registry Editor

8. Close all open instances of the affected process (and IE) and restart the program.

The second option is to opt-out of the new cross-domain protection feature (which blocks access to scripts on the local file system). Opting your application out of this feature leaves it vulnerable to web sites that may scan your computer looking for script files or other information. If your application is designed to host arbitrary content, this option is not recommended.

To opt-out of the cross-domain protection feature:

1. Click ¡°Start¡±, ¡°Run¡±.

2. Enter ¡°regedit¡±

3. Find and select the following registry entry:
HKEY_LOCAL_MACHINE
SOFTWARE
Microsoft
Internet Explorer
MAIN
FeatureControl

4. Click ¡°Edit¡±, ¡°New¡±, and ¡°Key¡±

5. Enter FEATURE_BLOCK_LMZ_SCRIPT

6. Next, click ¡°Edit¡±, ¡°New¡±, and ¡°DWORD¡±

7. The name should be set to the process name of the application experiencing the problem. For example, if the application is mybrowser.exe, then enter ¡°mybrowser.exe¡± (without the quotes)

8. The Value (double-click on the newly created entry) should be set to ¡°0¡± (this opts the process out of this feature, enabling the workaround)

9. Close the Registry Editor

10. Close all open instances of the affected process (and IE) and restart the program.

I edited the registry to opt-in the lockdown feature, however, I still am unable to view any .swf files.

I am wondering if there is another security setting or flag that needs to be changed to allow these files.

I also tried to use option 2, but have the same result.....a blank page with an error.

I agree. I am hoping that next month's updates address this problem. It is keeping me from propagating IE7 to other systems.

Bill

Now I have found another issue I need help with.

Since I have installed IE7, anytime I click on a link, my computer slows down (to a crawl at best) until the page is loaded. Then everything seems to run normal (browsing, scrolling, printing, etc.).

Anyone have any ideas or suggestions as to why it takes so long to access a link from within IE7.......wish I had 6 back !

Thanks in advance.

I started the REGEDIT and the FEATURE_LOCALMACHINE_LOCKDOWN already had an entry for iexplore.exe with a 1 in the VALUE field.

The second entry (FEATURE_BLOCK_LMZ_SCRIPT was not present so I created it as directed in the documentation and set the program to iexplore.exe and left the VALUE at 0.

I rebooted and my swf files are now working!!

Thanks so much.

Bill

MY application generates a PDF file, it loads the PDF shows the text I have embedded (token from a database) but is ignores the embedded pictures.

It is a typical IE7 issue becouse when I load that page with Firefox or Opera the page is shown properly including the pictures..

I have searched through all settings, but can not find a reason why the embedded pictures are blocked. Is it possible that this is a securety issue as well like posted above in some answers

I am using WinXP SP2 home edition.

Has that kb article come out yet

Also the reference to "Compatibility in IE6 for Windows XP SP2 under the section Local Machine Zone Lockdown" talks about the CoInternetSetFeatureEnabled function.

Can anyone provide an example of how to implement this function in c#

Thanks, Tad

How do you determine which application is causing the problem I have several site which will not play imbedded video but I don't get an error message; just a blank page.

Thanks, Dave

I do not get an error message about Flash and I have the most recent one. I get "Internet Explorer cannot display the web page".