ExtraSubst 10.7 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. This tool was originally created by WinTools Software Engineering. ExtraSubst relates to System Utilities.
From the developer:
Extra Subst - program designed to make access to frequently used folders of your computer easier. It is also used to create, edit and remove virtual drives of your computer. Extra Subst creates virtual drives on the basis of selected folders. Physical drives remain unchanged and are not divided into additional partitions.
You may want to check out more software, such as Extra Subst, which might be related to ExtraSubst.