How to work with LocalDB with an mdf database?

USE:

• heidisql_12.1.0_64.r6540

I will have:

• c:\Program Files\Microsoft SQL Server\130\Tools\Binn\SqlLocalDB.exe
• c:\Program Files\Microsoft SQL Server\150\Tools\Binn\SqlLocalDB.exe
• multiple mdf files. The files are located in different folders.

Example:

• I opened the Windows command prompt;
• I entered the command `sqllocaldb info MSSQLLocalDB';
• I received:
  C:\Users\Root>sqllocaldb info MSSQLLocalDB
Name: MSSQLLocalDB
Version: 15.0.4153.1
Shared name:
Owner: HOME-PC\Root
Auto-create: Yes
State: Stopped
Last start time: 28.08.2022 14:48:09
Instance pipe name:

Questions.

1. How do I open one mdf file in HeidiSQL?
2. How do I open multiple mdf files in HeidiSQL?

Note. I have studied the topic: Unable to connect to LocalDB with HeidiSQL--stackoverflow.com.

It works for me.

I did:

• I opened a C# Visual Studio project;
• in Visual Studio, in the server Browser, I connected to db1.mdf;
• I performed the steps described in Unable to connect to LocalDB with HeidiSQL--stackoverflow.com .;
• I connected in Heidisql to db1.mdf;

BUT!!!
How to connect in Heidisql to db1.mdf without using Visual Studio?

In other words:

• I opened the Windows command prompt;
• I entered the command sqllocaldb info MSSQLLocalDB;
• I got: State: Stopped;

Further see the section `Questions'.

Is it possible to get a solution on this issue? Or does heidi not solve this issue?

There is no support for mdf files in HeidiSQL.