Returns the length of a file in bytes (Long).

pathnameThe full pathname of the file you want to examine (String).

* The "pathname" will often include a directory and a drive.
* If the file is question is currently open, the value returned is the size of the file immediately before the file was opened.
* You can obtain the length of an open file by using the LOF function.
* The equivalent .NET function is Microsoft.VisualBasic.FileSystem.FileLen
* For the Microsoft documentation refer to


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