Hello,
For reading the .cnt files, we use the EEGLAB plugin distributed directly by ANT:
http://download.ant-neuro.com/matlab/
The ANT release notes mention the following:
Update adds support for .evt file format. At the same time the dialog for pop_loadeep no longer asks for confirmation to load .trg files. This is done automatically. When a .cnt file is read, the importer checks for an accompanying .evt file. If found, its contents are loaded. If not, it will try the same for an accompanying .trg file. If that also fails, the embedded triggers in the .cnt are tried.
Reading these release notes, I realized that the .avr files are supposed to be supported by this plugin as well, but no one ever asked me to add it in Brainstorm. It might be very easy to add the support for these files, but I don't have any data in this format.
Could you send me an example file?
(upload it somewhere and post the download link here)
Thanks
Francois