cascnvim /f{file-name}] [/op{path}] [/q] [/o] 
               	 | /f{file-name} | Path and filename of the data conversion macros file | 
| /op{path} | Path to the directory in which dfhdrcnv.dat is created | 
| /q | Run in quiet mode; that is, the contents of the data conversion macros file are not displayed | 
| /o | Overwrite existing entries | 
The /op parameter sets the environment variable TXRDTP, which determines where dfhdrcnv.dat is created.
Comments:
If /op{path} or TXRDTP is not set, dfhdrcnv.dat is created in %ProgramFiles(x86)%\Micro Focus\Enterprise Developer\etc\cas .
On UNIX you can use a dash (-) before a parameter as an alternative to a forward slash (/).
If a path or filename contains spaces, it should be enclosed in quotation marks. For example, "e:\dev mto\files" .