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>I would first be most suspicious that the other application with open files has this one open without you realizing it. Can you check which workstation has the file via your network monitor?

Cannot get to the network monitor at this company. You know big companies and rules!<g>

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>No. the OS has no concept f inheritance, this is implemented solely by VFP. And, when you open a library that holds the definition of a child class, it opens the parent class library to get the inherited PEMs. But it does NOT open the libraries containing other children, because It can't know about them- the parent class definition does not store a backlink to the all child classes.

That's what I would have thought too. I've check their project files to see if the references are wrong, but have not yet gone through each control one by one to see if any refer to the wrong directly, like the test directory.