Change the default file format

When you create a new, blank database, Access asks you lớn name the database tệp tin. By mặc định, the tệp tin is given the ".accdb" extension — it is created in the Access .accdb tệp tin format for your version and is not readable by earlier versions of Access. 

You have the option of creating files in either the Access 2000 format or the Access 2002-2003 format (both with the extension ".mdb"). Then, when you create a new database tệp tin, the resulting tệp tin is created in the earlier Access format and can be shared with others who use that version of Access. This can be helpful if you have upgraded lớn a later version but you share files with others who have not.

To change the mặc định tệp tin format

1. Click the File tab.

2. Click Options.

3. In the Access Options dialog box, click General. 

4. Under Creating databases, in the Default tệp tin format for Blank Database box, select the tệp tin format you want as the mặc định.

5. Click OK.

6. Click File > New.

7. To create a new tệp tin, type the tệp tin name you want (be sure lớn leave the extension as is) and click Create. If you don't want lớn create a tệp tin at this time, click Cancel.

Convert a database from one format lớn another

If you have an existing database that you want lớn convert lớn a different format, you can choose a format under the Save Database As command. This command preserves the database in its original format and creates a copy of the database in the format you specify. You can then use the copy of the database with the version of Access that you want.

Note: If the original database is in the ".accdb" file format and contains complex data, offline data, or attachments, you cannot save the copy in an earlier format, such as Access 2000 or Access 2002-2003.

1. If the database is not open already, open the database you want lớn convert.

2. Click File > Save As > Save Database As.

   Note: If any database objects are open when you try lớn save it in a different format, Access must close the objects prior lớn creating the copy. Click Yes lớn have Access close the objects (Access prompts you lớn save any changes, if needed), or click No lớn cancel the entire process.

3. In the File name box in the Save As dialog box, type a tệp tin name for the copy of the database.

4. Click Save. Access creates the copy and then opens it.