>Anyone know why sometimes use + a nonexistent file generates an error, and sometimes instead opens a file selection box? I'd like to have it consistently generate an error that could be trapped? Thanks in advance.

---

You can simply Copy the ON ERROR example on VFP help!
Then, add further control on Error number.

e.g.
if ErrNum = 1884 && Duplicate Key
TableRevert(.f.)
endif

---

if you want to ensure the table is exist before use, change use coding:

if File("MayHere")
Use MayHere in 0 order tag myKey Alias IsHere
else
Use ? in 0 Alias IsHere && will give a fiel open dialog to open file...
endif