FileMaker Pro shows the Open File dialog box automatically when the program first starts. If you want to skip past this step and go right into a particular file when you start FileMaker Pro, you can do this by creating an icon for the file in Program Manager.
In Program Manager, choose New from the File menu. The Program Item, which is one of Winodws' names for icons, should already be selected. Click OK. In the Description section, type whatever description you wish. In the Command Line, type the EXACT location of the file (i.e. which directory it is located in) along with the file name EXACTLY as it appears in FileManager. For example, a FileMaker Pro file called "Billings.fm" that is in the FMPRO directory on your C drive will have an icon with these properties:
Description: My billing file
Command line: C:\\FMPRO\\FMPRO.EXE Billings.fm
Working directory: C:\\FMPRO
When you click OK, an icon should be created with the FileMaker Pro symbol. To select a different icon, click on the icon just once and choose Properties from the File menu. If you click on the Change Icon button in the Program Item Properties dialog box you can select a different icon.