Function to check whether file exists
The FILE() function returns .T. if the file exists and .F. otherwise. FILE() checks for the existence of the file in the current directory, but not in the PATH (specified with the SET PATH TO command). FILE() does not check the access permission of the specified file for writing, it only checks that the file can be opened for reading. If no file extension is specified in the filename <expC>, then the file extension ".dbf" is concatenated to the end of the filename. This means that FILE() cannot be used to check for the existence of files without extensions.
if file("names.ndx") erase names.ndx endif