How do I force windows to use a specific version of SQLCMD?
Have you tried updating the PATH variable?

For Windows 10, do the following: 


In the File Explorer, right-click on This PC.
In the context menu, click Properties.
In the System window, click the Advanced system settings page on the left-hand side.
In the Advanced Tab, click on  Environment Variables.
In the System Variables window, highlight Path, and click Edit.
In the Edit System Variables window, insert the cursor at the end of the Variable value field.
If the last character is not a semi-colon (;), add one.
After the final semi-colon, type the full path to the file you want to find.


In your case: C:\Program Files\Microsoft SQL Server\110\Tools\Binn

Find the path with 100 in it, and then remove it.


Click OK in each open window.

Word of caution: After doing these steps, you will not be able to auto-find any other exe's that the system was able to find earlier in the older path you just removed.