Some times on how to replace a SQL Server could be to contact a computer information technologist if you don't know what your doing as changing certain setups or settings can throw everything off.
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In order to fix a computer it is best to know what the problem is and how to fix it. So it would be recommended that a person know how to operate a computer first.
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a pc fix software
using php
Some examples are SQLServer , MySQL, Orcle
theoretically you can create 32,767 databases, but practically it depends on server configuration
By SQL Server I am assuming you are referring to Microsoft's flavour of SQL. No. There is no version of SQL Server that runs on Linux
what is the difference between sqlplus and sqlsever SQL*PLUS is oracle command line utility that allows access to Oracle databases sqlserver is a Microsoft RDBMS (database management system), vaguely based on a Sybase RDBMS if you are looking for SQL*PLUS like interface to SQL Server, the one one is SQLS*PLUS from www.memfix.com
It really depends on how you obtained the file if it was a download chances are it was created with Alcohol 120% as some sort of an image file. Otherwise if you were browsing your computer and were just curious about the file .Mdf is typically used by MSSQL (Better known as Microsoft SQLServer). So to answer your question the 2 major culprits in this would be either Alcohol 120% or Microsoft SQLServer. Hope this helps!