The QBPrint.qbp contains the settings from the Printer setup window stored by QuickBooks to print forms.
On Windows Vista, it’s normally found at:
where yyyy represents your version of QuickBooks, as in QuickBooks 2009.
On Windows XP, it’s normally found at:
C:Documents and SettingsAll UsersApplication DataIntuitQuickBooks yyyy
If QuickBooks can’t find the file in the expected location, it will automatically recreate it from default data.
Issues relating to this file are sources for several printing problems in QuickBooks, and a number of troubleshooting techniques involve this file. One common technique involves renaming this file so that QuickBooks will automatically create a new one, as discussed in this Intuit knowledge base article.