Opening a file copies the data it contains into memory, making it available for you to edit or print the plan drawing. You can open .PRO files from previous versions, including 17.6, 17.7, and 18.0.

To open an existing file

1 Choose File > Open (or press Command-O). The Open dialog appears.

2 Find the file you want to open.

3 Select the file you want to open and click Open.

To see a list of recently opened files

• Choose File > Open Recent then choose the file you want to open from the pop-up menu. The file opens.

To clear the recently opened files listing

• Choose File > Open Recent > Clear Menu. The list of files is cleared.