>There is a full path to the file. I can open (USE) the form, but it is READONLY. I have worked some more with this and it seems it is intermitten (do not know what's causing the behavior). So, my question is what would cause a readonly on a USE command? From the documentation of the USE command there is not an option for opening in READONLY mode (just SHARED or EXCLUSIVE). I can open the form normally with MODIF FORM so I know that the file is not marked READONLY (and can see from attributes in Win Explorer).
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>I would expect that the only way to have READONLY on a table (in this case a USEd form) is if the file attribute is READONLY; are there any other ways?

NOUPDATE keyword would make it read-only. Could it be that something changes files attribute or your read-write rights change during the session?