This article describes two file formats that use the RPM file extension. It also explains how to open the file and convert it to another format.
Tuesday Tech Tip – Building RPM Packages
A file with the RPM file extension is a Red Hat package manager file used to store installation packages on Linux operating systems. These files provide an easy way to distribute, install, upgrade, and remove software because they are "packaged" in one place.
RPM is also the file extension for plugins used by the RealPlayer software to add extra functionality to the program. This has nothing to do with what Linux uses them for.
It is important to realize that Red Hat RPM files cannot be used on Windows machines like they can on Linux systems. However, since they are just archives, any popular compression/decompression utility, such as 7-Zip or PeaZip, can open one to reveal the files inside.