Hi, I sent an email to the team in the listing to see if they can provide additional information about the file formats involved in HEC-RAS. Finger-crossed.

The following link does include a Linux download, but with little support - https://www.hec.usace.army.mil/software/hec-ras/download.asp....

Also doing some digging on Github, I did find an reverse engineered version of a python version of RAS via win32com control - https://github.com/mikebannis/rascontrol, there's also projects of varying degree across Github - https://github.com/search?q=hec-ras.