How do I make it save with a custom extension to my mod. for example, insted of project.sb, it would be project.mu1. Help appreciated!
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Try going to Scratch-UI Panes->ScratchFrameMorph->File Read/Write
Then go to saveScratchProject and saveScratchProjectNoDialog and find all of the .sb's and change them to whatever you want. Hope that helps!

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