[help]any Software To Merge Rm Files Quick?

[jedipi 0]

now, i have some RM files.the file name look like this:V100.rmV101.rmV102.rmV103.rm...I wanna merge those RM files into one big RM file.V101 apend to V100.Then V101, then V102.....I did try Readl Editor which come with Helix Producer Plus 9.However, the perfroments become slower and slower after 10 or 20 files were merged.I have about 40 RM files. It took huge amout of time to finish the task.Is there any other softwares or methods can task like that quickly???