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.