FILESIZE()

Syntax:

       Then: aa=FILESIZE(handle)

"handle" is the file handle returned by OPEN() or CREATE().

Return value
The size, in bytes, of the file.

Note: In a text file, it is possible that the value returned by FILESIZE() is not the same number of bytes that can be read from the file.

Version Ref:  4.5

Description:

Returns the number of bytes in a file.