run .REG file when xtracting SFX archive

[visitor]

is there a specific command line to input @ "Run command line after extracting" under "SFX Options" that will automatically import a *.reg file when the SFX is extracted.
if we just put the *.reg file name in the "Run command line after extracting", we get the error prompts;
"This file does not have a program associated for performing this action. Create an association in the Folder Options control panel"
&
"No application is associated with the specified file for this operation."

Our Windows XP system certainly knows how to handle .REG files. SFX archives created with WinRAR handle .REG files with no issue.

Any ideas?

Thanks