The full form of QIF is Quicken Interchange Format. It’s used on Computing ,File Extensions in Worldwide

Quicken Interchange Format (QIF) is an open specification for reading and writing financial data to media

The Quicken interchange format (QIF) is a specially formatted text (ASCII) file that lets you to move Quicken transactions:

• From one Quicken account register into another Quicken account register, or
• To/From another application that supports the QIF format.

Note: For Quicken to translate data from a text file into the Quicken register as transactions, the text file must be in the QIF format.

Required File Formatting:

• Each transaction must end with a symbol, indicating the end of entry.
• Each item in the transaction must display on a separate line.
• When Quicken exports an account register or list, it adds a line to the top of the file that identifies the type of account or list. Listed below are the header lines Quicken adds to the exported files:

You can force Quicken to import all transfers, regardless of whether Ignore Transfers is selected when the file is imported. You must add a line to the file being imported into a Quicken account. Use a text editor or word processor to put the following line right after the header line at the top of the file:

!Option:AllXfr