What is a RTModel and can they be deleted?
RTModels (Run Time Models) are a compiled representation of the models pulled from the Content Store database. When the package is updated or if there is no RTModel file available in the data directory, one is recompiled when the package is accessed. The previous version of the RTmodel file are not deleted
These files in this directory c8/data/cqe/ are local copies of the Run Time Model. In the configuration manager you can change this location under environment -> 'Data Files Location'. Restart Cognos 8 service and the RTModels will be created there.
RTModel files are created when the first user has accessed the published package. These files can be deleted, but will be recreated again once the package is accessed again.