Save Filename Naming... button 
This option provides functions to name the translated file.  These settings are retained.   
Options include:

Use this
Click this button to use whatever name is typed in the adjacent field.

Use this & add 1 (two options)
Click this button to increment a number at the end of the filename.  
If the last character was not a number, 01 is appended. 
If the before.extension option is used, the digit preceding the extension will be incremented. Example:  Image01.PCX would be followed by Image02.PCX.
If the at end option is used, the last digit of the filename will be 
incremented.  Example:  Image.001 would be followed by Image.002. 

To control the starting number at the end of the filename, or to control the number of digits in the number, edit the filename accordingly. 
Example:  To start with number 23, type a filename like testimage23.
Example:  For a folder of 8000 files there should be 4 digits available, for instance, testimage0001.

Original name + (default is on)
Use this option to form the save filename from the original filename 
plus whatever additional options are chosen.

Strip .extension first (default is on)
Check this box to remove everything following the last period of the original filename.

No Extension
Click this button if no extension is desired.

Extension
Click this button to append to the filename the generic extension defined in the field at the end of the line.  Enter up to 28 characters in the field for the extension.

Extension for Save Format
Click this button to append to the filename the proper currently defined extension (displayed in the field at the end of the line) based on the currently selected save format.  This is mostly useful for non-Macintosh images in which applications check the extension to determine the format.  

Don’t duplicate extension (default is checked)
This only applies if one of the Extension buttons is selected. Click this box to prevent duplicate extensions. Normally the extension gets tacked onto the end of the original name. This prevents results like Dog.PICT.PICT if a file is saved more than once. 

When all Naming... options are set
Click OK. The Save Filename field will reflect any changes to the Naming... settings.