>>While compiling the project (for simplicity, I just selected a "rebuild project"; all other options are unchecked), I get a message "error reading file". Not knowing which file caused this, I created a new project; the "error reading file" appeared for one particular class library, more specifically, a file called vfxform.vct (part of the Visual Extend framework). According to the help, the error message means that:
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>>"The operating system returned an error while Visual FoxPro was attempting to read the specified file."
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>>However, I can open the class library, and make a duplicate on disk. What might cause this?
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>>I also checked whether the file isn't read-only. (It isn't.)
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>>TIA,
>>
>>Hilmar.
>
>At a FoxPro conference (in Sydney), Rick Schummer mentioned a way to identify which file is causing a problem during a build. I wish I could remember how he did it! Something to do with the debugger I think.
>
>Anyone know how to identify the problem file during a build?
>
>Cyril

Open debugger OUTPUT window before the build and the error will be re-directed there.