During install of 27.0.1 (on a clean machine) I clicked "Open Slickedit sample project"
I picked the C# sample and got this error
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SlickEdit Pro
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Unsupported extension for workspace filename. Can't open C:\Users\joe\Documents\My
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OK
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The sample projects are located here: C:\Users\joe\Documents\My SlickEdit Config\27.0.1\SampleProjects\csharp