What is .kr file ?

The .kr files contain engine application logic shipped by Appian. They do not contain data and therefore do not need to be part of regular data back ups. The should be backed up when creating a full backup of the installed software, for instance when upgrading or applying a hotfix.

Thanks brett for the post, but wanted to ask is there any information I can get about such type of files, I mean like, do we have any documentation about these. It would be really helpful for us if you can give those details.

Thanks brett for the post, but wanted to ask is there any information I can get about such type of files, I mean like, do we have any documentation about these. It would be really helpful for us if you can give those details.

I need to use a portal that allows .kr files only to upload. I need to send .pdf, .jpg, and .rar. The only way I've found to convert is www.youtube.com/watch?v=qm_BlGeUYb4. Alas, neither the link nor the email address there works.
How can I convert other file types to .kr?
Thanks a lot.