客戶檔案專案係咩格式？？

One possible choice is the Microsoft Project Professional 2013 which can help you to effectively manage important projects.
It can help you to prioritize by aggregating everyday work, project tasks, important details, and timelines.
For simple projects without complex collaboration among team members, real time status update, and not much break down tasks, you might consider using Excel to keeptrack the project timeline and progress status of tasks instead.

The standard file format for a project uses the .mpp extension (which stands for Project Plan).
Like other software from the same vendor, the Microsoft Project software undergoes a number of version changes: Microsoft Project 98, Microsoft Project 2000-2002, Microsoft Project 2003, Microsoft Project 2007, Microsoft Project 2010, Microsoft Project 2013. The latest two versions 2010 and 2013 are using the same file format. You may consider using the 2010 version or even an older one if it could already meet your work requirements.

2015-05-12 17:27:39 補充：
Of course, if the project files need to be shared with the customer(s), you need to check what project management software is using by the customer(s) so that both parties can work on the same set of files.