See if http://www.berezniker.com/content/pages/visual-foxpro/returning-unc-path-associated-local-device can help.

>This helps a lot but it doesn't solve all my problems.
>If the path to the files is given in the form '\\[machine]\resource'
>anetresources() does the job.
>But if the resource is mapped to a network drive I still in trouble.
>Any suggestions?
>
>>Check ANETRESOURCES() function.
>>
>>>If I try to open a table in a unavailable network resource
>>>the error numbers or messages fired are related to
>>>the non existence of the file. I've tried with low-level file
>>>functions but the results are the same.
>>>How can I know if the network resource is available?
>>>Thanks in advance.