Description:
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$test = new DOTNET('mscorlib', 'System.IO.File');

That yields a "Fatal error: Uncaught exception 'com_exception' with message 'Failed to instantiate .Net object [CreateInstance] [0x80131513] '" error.  Per the comments on php.net/class.dotnet, I thought this might work, instead, but it doesn't:

$test = new DOTNET('mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089, processorArchitecture=x86', 'System.IO.File');

The example on php.net, however, does work:

$test = new DOTNET('mscorlib', 'System.Collections.Stack');

I think what the problem really is is this: System.IO.File is a static class.  It's not intended to be instantiated whereas System.Collections.Stack is.  In light of this, I think either the ability to call methods within static dotnet classes ought to be added or, failing that, a note should be added to the documentation stating that only instantiatable classes can be used with the DOTNET object.

Reproduce code:
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$test = new DOTNET('mscorlib', 'System.IO.File');

Expected result:
----------------
(nothing)

Actual result:
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Fatal error: Uncaught exception 'com_exception' with message 'Failed to instantiate .Net object [CreateInstance] [0x80131513] ' in C:\path\to\test.php:3
Stack trace:
#0 C:\path\to\test.php(3): dotnet->dotnet('mscorlib, Versi...
', 'System.IO.File')
#1 {main}
  thrown in C:\path\to\test.php on line 3