Web.config - the settings and configuration file for a Windows IIS Web Application. .htaccess - the default filename of the directory-level configuration file for a Linux Apache Web Application.
Disclaimer: The URL Rewrite tool by IIS Manager gives you suggested web.config rules. Since it is not a one-to-one conversion, the recommendation is to test these rules in a development environment.
If you’re looking to create rewrite rules for the URL Rewrite Module,please see the article here
To convert .htaccess rules to web.config, launch IIS Manager.
Step 1. In the connections pane, select your site
Step 2. Double-click on URL Rewrite
Step 3. On the right, select “Import Rules”
Step 4. Copy-paste your .htaccess file or select it under “Configuration file”
Step 5. Click the “Xml view” to view in the web.config format
Now that you have the rules in web.config format, validate and verify the rules on a development server.