to be used by a protocol handler, the command line input should be able to handle urls. Proposed sheme: `protocol`://`mode`/?`param=value1`&`paramN=valueN` - [X] add procol handler stub d2a05343dab6e3cfc2c7a10d6b290d2d7b1479ed - [x] substitute environment variables in file name 98da526e3ade38966abcc445c405abd59eefab1b - [x] generate meaning full error messages in dialog 2432e54c33c417725b7d5f63c19eff86f87491f2 - [X] add example reg file 585ecb9432decb5f407cf7072c5a68ba4265be07 - [x] add documentation 046343102e0497bf1002857b755f82ab3b04235d