Have you tried to just search the runtime folder with Windows Explorer for the prop name instead of navigating to where you think it is? What I do is set up separate runtime files for each project I work on, this way props don't get lost. Then I save them to that particular runtime until I'm finished. 

I haven't run into this before. Best thing you can do is search with Windows Explorer for the prop name. It should find it now problems, just don't navigate to it manually. Let me know if you find it. 

Have a creative day!

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My Lil' Store