There is only one file type that uses the .KMY extension:
KMyMoney Data File
File created by KMyMoney, a personal finance manager for Linux; saves financial data such as bank accounts, transactions, investments, assets, and credit card information; used as the native save and load format for KMyMoney.
KMY files are XML files compressed with Gzip (.GZ) compression. Therefore, you can view the XML data manually by renaming the ".kmy" extension to "xml.gz," decompressing with Gzip, and then opening with any XML or text editor.
NOTE: KMyMoney can also be used on Windows with by first installig the KDE Platform, or on Mac OS X by using MacPorts.
Updated: February 8, 2012