How can I convert mmp files (Microsoft Project files) to xmind files?

I have received from a f开发者_如何学Criend some files in mmp format. I don't have Microsoft Project but I use xmind. How can I convert mmp files (Microsoft Project files) to xmind files?

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The extension for Microsoft Project is .mpp

The .mmp extension is from The old MindManager (maybe version 5 and below?). MindManager from version 6 onwards uses the extension .mmap

I'm also having problems opening .mmp Mindmanager files in XMIND. One way would be to open the .mmp files in MindManager 6 or later, and then save as .mmap. Then you can open the .mmap files in XMIND.