Bit of background for this. myDBR uses PHP's web server variable $_SERVER['REQUEST_URI'] for Export functionality. Unfortunately REQUEST_URI is not present on some IIS configurations. This has been in myDBR since 2.2 release.
Next version of myDBR does no longer rely REQUEST_URI to be present.
Before the next version is out, you just need to define the variable. This is where the Neosmart's script comes handy. It is just few lines of PHP code that defines the REQUEST_URI variable for PHP scripts. You put it in your php.ini auto_prepend_file directive. There is no side effects when defining the variable.
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myDBR Team