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 Environ.prg
 File look up and state control functions
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     FilePath( <cFile> ) --> cFilePath

     Extract the full path name from a filename.

     FileBase( <cFile> ) --> cFileBase

     Extract the eight letter base name from a filename.

     FileExt( <cFile> ) --> cFileExt

     Extract the three letter extension from a filename.

     FileDrive( <cFile> ) --> cFileDrive

     Extract the drive designator from a fully qualified filename.

     FullPath( <cFile>, <lClipPath> ) --> cFullPath

     Returns the full path of cFile; similar to the FoxPro FULLPATH()
     function.

     GetPath( <cFile>, <cPathSpec> ) --> cPath

     Returns the location of a file if found in cPathSpec; otherwise returns
     NIL.

     SetAll( [<aNewSets>] ) --> aCurrentSets

     Using an array of settings, change all global SETs and return their
     original settings in an array.  If no argument is passed, simply return
     current settings.