Here are couple common ones. For Windows users, we recommend WinZip . The K2000 and K2vx save files with the .KRZ extension. The K2500 saves them with a .K25 extension. The K2600 saves them with a .K26 extension.
All units are backwards compatible.
Hence, a K2500 can read both .KRZ and .K25 files. And a K2600 can read .KRZ, .K25, and .K26 files. There are a few issues to be aware of, discussed below. A K2000 can read .K25 files starting with version 3.16 of the OS, as long as the .K25 files were saved on a K2500 without KDFX installed. Previous to v3.16, it does not recognize the .K25 extension.