Off topic Unknown Exe Attachment

["N&M Smith" <nmsmith@xxxxxxxxx>]

I received an email from someone I don't know with a .exe attachment
>From  Kevin ( kfvinax@xxxxxxxxxxxxx ) 
Subject !"#$
The attachment
Regsvr32.exe  56.4kb
Winword.doc 4.62 kb

The document contains nothing 
Does anyone know what this Regsvr32.exe is.

Neville