If a Time Line DOS file has many exceptions to the Master Calendar it may take awhile to load.
1) Use the File Open command to open the Time Line for DOS file in Time Line for Windows.
2) Use the File Save As command and give the file a .TLP extension to save the file as a Time Line for Windows file.
3) Use the File New command to open a new file in Time Line for Windows.
4) Use the File Combine command to combine the .TLP file you saved in step 2. In the Data to Combine group, enable all choices. In the Master Calendar group, choose "Leave As Is". By making this choice, you are effectively replacing the Time Line for DOS calendar with the default Time Line for Windows master calendar (individual resource calendars are retained). Click OK.
5) Use the File Save command and give the file a .TLP extension to save the file with an appropriate name.
When you open the file you saved in step 5, the process will be much faster, since exceptions to the Master Calendar will be minimal. You may want to do some adjustments to your Master Calendar to reflect the appropriate nonwork days.