This is actually due to a feature -- to insert literal a double quote within a command-line parameter, the double quote char needs to be escaped with a backslash, and VisBuildPro 5 does this automatically for fields of custom actions that launch command-line tools.
The Inno Setup action wasn't designed to support the Inno Setup Extensions command-line tool, and it only supports a filename (no additional parameters) in the Filename field. You can just use a Run Program action instead and enter the exact command that you need.
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