I was able to recreate your problem and It appears you've encountered an incompatibility between recent versions of GPG4Win and Cryptophane. The current version of GPG4Win is 2.1.0, which combined with Cryptophane 0.7.0 (the last update was in 2009) yields the exact issues you've encountered. I tried to install GPG4Win 2.0.0, the oldest version available on the GPG4Win website, but that didn't work.
The only solution I found was to install Cryptophane from the Cryptophane 0.7.0 beta + GnuPG 1.4.2 full installer package. As the title suggests, this package includes an older version of GPG than is available through the GPG4Win website. Once installed, I was able to load my test key files and use Cryptophane as normal.
Installing Cryptophane 0.7.0 beta + GnuPG 1.4.2:
- Download the full installer
- Close any GPG related programs like Claws, Kleopatra... actually, just close everything
- Launch the installer, overwriting any previously installed version of Cryptophane
- Close Cryptophane if it opens automatically after the install
- Update the configuration file, cryptophane.ini in the install path:
- Comment out the gpg-path configuration option which may have been set by a previous install
- Make sure the homedir configuration option is commented or points to the folder containing your .gpg files (your key files). If this option is commented out, the default path is %appdata\gnupg
- Save your changes to the cryptophane.ini file and launch Cryptophane - you should be good to go!
Hope this helps,
Matt