Open the file in MS Office 2010 and save the file in compatibility mode.
It will convert the file, remove the Compatibility Mode designator, and retain the file extension to .doc.
It will say "[Compatibility Mode]" in the title bar after the file name.
Compatibility mode
Did you try to install it in compatibility mode & run the program in compatibility mode as well?
Damage
Go to "Program Files >> Illusion Softworks >> Hidden & Dangerous 2" or whichever directory you installed it under and find the application file named "hd2". Right click, properties, compatibility tab and run in compatibility mode for XP SP2. You're good to go
Virtual real mode
You can open a 2007 Excel spreadsheet with Excel 2003 if you save the file in Excel 2007 using "Save As" and select the 2003 compatibility mode.
Yes but it requres downloading the d3drm.dll file, runing it in Compatibility Mode, and maybe Unblock the Attribute setting. So far the graphics are not all there.
Right Click > Properties.
You can maintain backward compatibility by converting the document to an older version or format that is compatible with the previous system or software. This may involve saving the document in a different file format or using compatibility mode in the software. Make sure to thoroughly test the converted document to ensure that all functionalities are preserved.