We are not aware of such problem and I was unable to reproduce it on our side. Could you please open a support ticket and attach a simple runnable project that reproduces the problem so we can investigate it further?
On a side note, by design RadGrid (the grid component of RadFileExplorer) truncates the file name so it can fit into the cell. Could you try to resize the cell to see if it still displays truncated name?
For your convenience I have uploaded a movie
demonstrating my test using standard RadFileExplorer configuration.
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