Looking for filters to convert FrameMaker files on Linux

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I still have on my computer several personal documents that I wrote and saved in FrameMaker format (.fmk file extension) in the 90’s, that is before I realized how badly proprietary file formats can impact economy, culture and personal stuff. Therefore, right now those files are just wasting space on my hard drive, even if I’d really like to access again some of them. I am sure there are many thousands of people in the same situation. I have tried to look for converters, but it looks like there are no FrameMaker converters for Linux these days! If anybody has developed but not released such filters yet, please let me know. Here are some details.