Open the file in low-level mode using FOPEN, FREAD and FCLOSE.

Check VFP8 Help topic for more details:
Table File Structure (.dbc, .dbf, .frx, .lbx, .mnx, .pjx, .scx, .vcx)

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Table flags:
0x01 file has a structural .cdx
0x02 file has a Memo field
0x04 file is a database (.dbc)
This byte can contain the sum of any of the above values. For example, the value 0x03 indicates the table has a structural .cdx and a Memo field.

n+2 to n+264
A 263-byte range that contains the backlink, which is the relative path of an associated database (.dbc) file, information. If the first byte is 0x00, the file is not associated with a database. Therefore, database files always contain 0x00.