I have several very old drawing files, which were readable in Mathcad 4.5 (probably, since they are not readable in v5.0). I have long since upgraded, one version after another, and dumped all my old version install floppies, although I still have v5.0, for what it's worth. The Mathcad files in which these drawing images were loaded no longer display the images in any version from v5.0 on, of course. The drawing files are .dwg files, but Autocad products no longer read them either.
I had a fellow look at the image files who is familiar with lots of old formats. He said they must be old GenericCad files, from before Generic was bought by Autocad. The early dwg's were not the same as what the standard format eventually became. The drawing files are loaded into the Mathcad files by marking the beginning and ending of the file name by "?". As I recall the Mathcad version that read them was probably the first version of Mathcad that was able to read image or drawing files. Every Mathcad version since then has not been able to read these particular files.
I have acquired version 6.0 of GenericCad. It says the files have errors in them. Haven't been able to locate any older versions.
Question is, do any of you guys have install images of Mathcad 4.5 that I could link to, or you could email to me? I would very much appreciate it if so.
Thanks,
Dave