FoxPro JustExt() function
The VFP JustExt() function returns the extension from a
string containing a file name. For example:
If the file has no extension, or if the file name just ends in a
period, then an empty string will be returned.
not look at the file system or check that the parameter is a
properly formed name or path. All that it does is look for the
final period in a string and return the characters that follow it.
Note that this implies that the function will return the final extension
from a file name that includes two periods and two extensions.
Microsoft Access does not have equivalents to these FoxPro file name
commands so I wrote this library
Visual Basic functions
to do give me the same facilities in VBA.