It is necessary for me to make it possible for
.htaccess files to be usable with IIS. Is there a way for this to be done? I know that on its own, IIS is not capable of handling this, but could I perhaps install some third party application that could do this for IIS?
You can use this software :
Helicon Ape provides support for Apache .htaccess and .htpasswd configuration files in Microsoft IIS. It literally implements Apache configuration model and nearly all Apache modules in a single IIS add-on, not only making IIS compatible with Apache, but also extending it`s functionality by a number of highly essential features.
Includes following modules: mod_rewrite, mod_proxy, mod_auth, mod_gzip, mod_headers, mod_cache, mod_expires, mod_replace and others. You can check all currently available modules in the compatibility chart (the list is growing with new builds).