Download the Chuon Nath Dictionary for Khmer for PC in unicode. This is a great resource, and is official. It works with both 32-bit and 64-bit Windows based systems and is Java based so should be multi-platform (Windows and Linux, but supposedly not with Mac yet).
Download it here: Electronic Unicode Chuon Nath Dictionary
Download a user-friendly installer that will install the English and Khmer SBBIC Unicode Dictionary embedded inside the Lexique Pro program (Updated 8/13/10 27,693 words and phrases).
The SBBIC dictionary now includes the KhmerOS glossary – Special thanks to a the Open Forum of Cambodia and NiDA for allowing us to import the glossary. This offline dictionary was compiled from the SBBIC Khmer Collaborative Online Dictionary at http://dictionary.sbbic.org Please visit the online dictionary and contribute new terms and or correct any errors so that they can be included in future releases of the dictionary.
Download: SBBIC Self-installing English and Khmer Unicode Dictionary version .06
Download our free English to Khmer (and Khmer to English) Dictionary. It’s free, and you can even expand the dictionary by adding your own words.
Download: SBBIC English to Khmer Dictionary (5519)