I don't see this. Here's the test I run.

OPEN DATABASE (HOME(2) + "Data\testdata.dbc")
USE products
COPY STRUCTURE EXTENDED TO tstru
CREATE testxx from tstru

>Hi All,
>
>I'm testing my vfp7 app under vfp8 beta.
>The line of code I'm having error is:
> CREATE filename1 FROM filename2
>
>Now, in filename2, under field 'field_name' I specified names that have underscores in them.
>
>It says: "Field name is duplicate or invalid"
>
>It ran just fine in v6 and v7, but v8 beta boms. To run without error in v8, you must remove the underscores.
>
>Can someone verify if this is a bug?
>
>--Ahmed