Before you can change an ACL, you must get the current one. There are two ways to do this with PowerShell. Learn how to get the current ACL and modify it.

I assume Heidi uses varchar literals to insert data into MSSQL. You cannot do this. You cannot do that because varchar literals are lossy when they contain data outside of the current codepage. For ...

@danfowler had an interesting idea. When a person uploads a database file, the server side should also accept and import CSV files. This probably wouldn't be hard to do (eg detect CSV format, convert ...