Issue while extracting from Office file

[rohinmvp]

I have a Word template containing some forms in my .dotm file.
I have extracted my .dotm file into a folder from which I am committing the code to SVN.

When I make changes to the code for the form, I am able to successfully extract the '.frm' files with the code.
However, when I make any UI changes in a form, and try to extract them, I am getting an error as shown in the screenshot.
Error: 'File name cannot be null. Parameter name: sourceFileName'

I had to extract the template to a different folder to get around this issue temporarily.

p.s. I feel the buttons 'Apply' and 'OK' may not be correctly named, as both of them extract the files from the template. I happen to keep the tool open to extract multiple times while I am coding.