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function ExtractFileName(const S: FullFileName): string;
Returns only file name and extension parts of a string containing full path and file name.
If FullFileName ends with a backslash (\), the function returns last string. If FullFileName contatins no directory or drive information, the result is FullFileName unchanged;
var sFullAppPath, sAppName : string;
sFullAppPath := ParamStr(0);
sAppName := ExtractFileName(sFullAppPath);
//sFullAppPath = c:\FirstDir\SecondDir\SuperAppName.exe
//sAppName = SuperAppName.exe
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ExtractFileDir,
ExtractFileExt,
ExtractFileDrive,
ExtractFilePath,
ProcessPath,
ExpandFileName,
ParamStr,
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