The Program folder,i.e. where you installed the program (C:\Program Files\Photoshow......(or name of company)..
Other location: Documents & Settings> Your(User) Folder>Applicaion & Data> Photoshow....
Note that the Application & Data Folder is "hidden" - you need to go to Folder Options to unhide it first.....
Yet another location: Documents and Settings>Username>Local Settings> Applicationa and Data....

Also, make a note of where the data is saved at the save dialogue (Save in...) If you know the name opf the file and/or other details of the file, try to make a search for it....search if successful will provide the location....