I added support for ICC 2013. Enjoy!
Editor homepage: ICC Fixture Editor
FEATURES
* Edit fixtures in all career modes.
* Create custom tours and tournaments
* Add matches
* Remove matches
* Change match dates
* Change match type
* Change series length
* Change teams
* Supported versions:
** International Cricket Captain 2012
** International Cricket Captain 2013
INSTRUCTIONS
* Install https://iccfixtureeditor.codeplex.com/releases/view/107108 to install .Net 4 Client Profile (Vista and XP users only)
* Install https://iccfixtureeditor.codeplex.com/releases/view/107109
* Backup your fixture folder (C:/Program Files (x86)/Childish Things/International Cricket Captain 2012/fxt)
* Open a fixture file in the editor
* Edit to your hearts content
* Save
* Copy edited file back to fixture folder
* Edited file is loaded after new season
EDITING DETAILS
* Fixture files for International Cricket Captain 2012 are stored in fxt folder in game directory (e.g. C:/Program Files (x86)/Childish Things/International Cricket Captain 2012/fxt)
* Fixture file is loaded at the beginning of a new season
* The file numbering determines the season (e.g. fix13.fxt is full career 2013-14 season and int15.fxt is international only 2015-16 season)
* You can rename the files in order to load a schedule from a different season (e.g. Rename int17.fxt to int12.txt and a new game will use the 2017-18 schedule)