If you are trying to select "whole folder names" only, then use explicit backslashes:
SELECT * FROM FileInformation Where FilePath LIKE '" + myPath.Trim('\\') + "\\%'" AND Status <> 'Deleted'
But please, don't do it like that.
Do not concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead.