CodeView (cv.hlp) (Table of Contents; Topic list)
CodeView Error
     No symbolic information for 'filename' (CV0101)
 
     The executable file (or DLL if in OS/2) did not contain the
     symbols needed by CodeView.
 
     Be sure to compile the program or DLL using the /Zi option. If
     linking in a separate step, be sure to use the /CO option. Use the
     most current version of LINK.
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