>Hi,
>
>I have trapped (using Try / Catch) an error "File is not open" in the following section of the code:
>
>

>IF SELECT("V_WO_NUM") > 0 
>	SELECT V_WO_NUM
>	INDEX ON FIELD1 TAG FIELD1
>	INDEX ON FIELD2 TAG FIELD2
>	INDEX ON FIELD3 TAG FIELD3
>	INDEX ON FIELD4 TAG FIELD4
>	INDEX ON FIELD5 TAG FIELD5
>	INDEX ON FIELD6 TAG FIELD6
>	SET ORDER TO TAG FIELD3
>ENDIF 
>

>
>Before the above code the cursor V_WO_NUM is created by SQL SELECT (getting data from a VFP table).
>
>What could possible be wrong with the above (not one time but almost every other day) that it causes the problem? And I could never duplicate this error on my PC.
>
>TIA

Maybe the issue is permission-related.
When the file "V_WO_NUM" is physically written to disk (as "V_WO_NUM.tmp", no, as i.e."000084QX000A.TMP"), since it becomes too big to be kept just in memory, you got the error since the user doesn't have permission to write in the Temp folder you selected in your config.fpw file.
If you have a config.fpw with code like this:
TMPFILES=c:\temp
EDITWORK=c:\temp
PROGWORK=c:\temp
SORTWORK=c:\temp

be shure that the user has full permission on c:\temp; or just delete those statements, so files are created in Windows Temp directory.

You never get the error since you likely are administrator on your local computer, so you can write in the given folder.

HTH
Bruno