First, I'm not an Adobe representative.
* Contact; https://www.adobe.com/#
*** Following is for information only ***
* Older file formats refer back to IBM, XP, and even Window 10 days. You may need to access the WWW (the whole world system) to find an online app to open older file formats. It may be that the app (called program back in the day.) is there but needs to run on a certain platform. (XP, Linux, Win Vista, ect.)
* Try "opening" the file using the web browser as the app to open it. The browser will probably ask to search the www for a program that will open (but not necessarily read it).
* If you do know the title or author of the document. Then try to search the title, author to check if they re-published (posted) the document in a current format. Many archives perform this routine format update.
* A last ditch effort would be to convert the file to "TXT" or "ASCII" format. Then have a coder look at it to identify if it's a program, document, or picture.
* Documents in ASCII or Text format can be saved to a simple word document then uploaded to a current wood processor.
* Pictures will have to be converted with a conversion program to upgrade it to current format.
* Program can only be run on platforms that it was designed for. Like trying to run Atari on a Sony player. (though popular games have already been upgraded to the newer formats)
* You may need to address this question in a specific forum.; https://forums.adobe.com/community/acrobat/forms