Wanna launch FRx from within GP? Go Reports>Financial>FRx. If the path isn't already set, the FRx Setup window opens to allow you to specify the path to the FRx.exe file. Enter or browse to the path and click OK.
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Now FRx will launch from within GP. You might even want to set a shortcut on your Home Page or in the Navigation Pane so you don't have to navigate through the menus to launch it.