[Stackoverflow] [Progress OpenEdge ABL] How to validate a file input path? - PROGRESS 4GL

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Bharat

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Below query helps to validate when I keep invalid path. The problem is its failing when I enter " \ " or "." or any special characters. How to validate them?

Code: 
FILE-INFO:FILENAME = "\".

IF FILE-INFO:FULL-PATHNAME = "?" THEN
  MESSAGE "Invalid path".

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