How to bold text in a template file?

In a template file(.tpl) below, that I'm using with TheBat!
How do I bold the File Name (%SubPatt='2')? 

I tried using html < b > < /b > before and after %SubPatt='2' but that
didn't work and showed the tags in the message. Any suggestions? Thanks.

%SetPattRegExp='C:\\Folder\\(.*?)\.txt'%- 
%RegExpBlindMatch='%To'%- 
%ModifyOnce(To)%- 
%SetHeader(To,%SubPatt='1')%- 
%SetHeader(%SubPatt="2"')%- 

Hi %ABToFirstName="%ToFName", 

Your File Name: %SubPatt='2' is completed 
Thank you. 
Regards, %FromFName

 

 

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