Description:
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I try to open the CHM PHP handbook (any language except english) file from a third party editor (Nusphere, PHPEd).

All other languages except English fail to browse through the content.

It reports:
Action    Failed to navigate to URL:
mk:@MSITStore:C:\Program%20Files%20(x86)\NuSphere\PhpED\help\php_manual_de.chm::/res/class.mysqli.html

As this seems to be a URL I tried to open it with the Internet Explorer 8. This call also fails.

BUT if I change the URL to:
mk:@MSITStore:C:\Program%20Files%20(x86)\NuSphere\PhpED\help\php_manual_de.chm::class.mysqli.html

it works. The difference: I left the /res/ away at the end

The call in IE using the Englisch CHM file works fine.
mk:@MSITStore:C:\Program%20Files%20(x86)\NuSphere\PhpED\help\php_manual_en.chm::/res/class.mysqli.html

I tried the same with the French and Spanish language and the behaviour is the same as in the German version (no /res/ folder).

Conclusion: There seems to be a difference in the CHM file structure. The English CHM version has another folder called /res/ which doesn't exist in the German, Spanish, French and maybe other languages

Test script:
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Open a IE browser and enter URL that points to the English CHM file:

Example:
mk:@MSITStore:C:\Program%20Files%20(x86)\NuSphere\PhpED\help\php_manual_en.chm::/res/class.mysqli.html

Now re-write URL and point to other CHM language file:
mk:@MSITStore:C:\Program%20Files%20(x86)\NuSphere\PhpED\help\php_manual_de.chm::/res/class.mysqli.html

Change the URL to:
mk:@MSITStore:C:\Program%20Files%20(x86)\NuSphere\PhpED\help\php_manual_de.chm::/class.mysqli.html

No problem appears

Actual result:
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It's not possible to navigate/browse through a CHM language file with a third party product except the English version.