Thursday, December 20, 2007

Repairing Internet Explorer

Creating Internet Explorer extensions is not always an easy task. Erroneous extensions can make your IE to crash, become unstable or to behave unpredictably.

Even worse, uninstalling extensions can leave IE in a broken state, some things stop working properly. This usually happens when IE components are unregistered and IE registry keys are altered and not properly restored on uninstall. Here's a short list of damages I personally encountered:

1). 'Open in New Window' Command Does Not Work in Internet Explorer
I'll come later with examples of how an extension can break IE and how to avoid it. For now let's concentrate on how we can fix it. Download file, extract files inside and run "fixie.cmd"

Points of interest:
  • Internet Explorer components are registered using regsvr32.exe tool.
  • For IE7 mshtml.dll can not be registered as explained above; instead mshtml.tlb is registered using regtlib.exe tool.
  • Registering shdocvw.dll using regsvr32.exe is not a good idea on IE7 because it damages [HKEY_CLASSES_ROOT\Typelib\{EAB22AC0-30C1-11CF-A7EB-0000C05BAE0B}\1.1\0\win32 registry key.
  • reg_ieframe.reg file fixes the broken key above.

Sunday, December 09, 2007

Allow local scripted HTML files to run in IE7

During automatically testing Twebst library I was very annoyed about IE7 refusing to properly open local HTML files that contains scripts. The following message is displayed:

"To help protect your security, Internet Explorer has restricted this web page from running scripts or ActiveX controls that could access your computer. Click here for options..."

It took me several minutes to find the hidden option that turns off this warning. First I looked for it in Security tab options but it was actually in Advanced tab. Here's how you find it:

1). Go to:
Tools > Internet Options > Advanced > Security
2). Check:
Allow active content to run in files on My computer
3). Restart IE