The VFP low level file functions (LLFF) can be used to open a table as a file and read/write its header. The Table Header Record Structure is documented in VFP help under Table File Structure.

Note 1 Removing Structural CDX flag will effectively disassociate CDX file from the table but not delete the CDX file.

Note 2 Removing Memo flag will allow to open a table and access all fields excluding memo fields. Attempt to access the memo fields will generate an error.

It is easy to find out if a table belongs to the open Database Container (DBC) using INDBC() function. Sometimes it's necessary to check it w/o referring to DBC itself.

VFP class below allows retrieval of a ZIP file comment or a list/count of files in the ZIP archive. It uses VFP low level file functions (LLFF) to directly read the ZIP file.