Firmware for signal processors or microwave link modules. In these cases, V105 could represent a "stable" build used for long-term deployment.
Usually denotes a specific project code, system department (e.g., Human Resources Journal, Hardware Registry), or an automated server prefix. hrj01222902v105rar
The final part represents the RAR archive format, a proprietary compression format created by Eugene Roshal that bundles multiple files into a single, smaller package. Common Use Cases for RAR Archive Strings Firmware for signal processors or microwave link modules