These files relate to Address Books created in Pegasus Mail. The former indexes the information stored in the middle. For earlier versions of Pegasus Mail, if an address book is not going to be modified, it could be indexed in a faster way through the PMSORT utility that comes with the dos-zip file, which generates an additional file with the .PM1 extension. (note this did not work for very large address books!). The filename can either be 8 digits or ADDR followed by 4 digits.
Report generated by Microsoft Performance Monitor, a system monitoring program for Windows NT and Windows Server; records information about processor and memory usage from various system processes.
PMR file suffix is associated with PhotoModeler. Project file.