Save dialogue with filename prefixed with folder name and remove file ext

[CraigP_]

Hi

When I type "save" in the command line I get a dialogue box (expected).
In the "File name:" textbox I get the current file name ie: "STD-393-1844.dwg" (expected).

Can I, using lisp get the following in the "File Name:" textbox "Old Revs\STD-393-1844"
That is prefix the filename with "Old Revs\" and replace the file extension with "_" (underscore).

I also wish to keep the dialogue open to allow us to add to the filename

Hope this makes sense.

What we see: 

What we want to see:

Thanks

[scot-65]

You might need to get a DOSlib for this request(?). I do not have one.
If anything, I will guess it will behave similar to GETFILED.

Look into VL-FILE-COPY function.
Assist this with your very own dialog interface (DCL).

File names cannot have a backslash.
If you are trying to direct into a subfolder, you will have to build the entire path.
No file extension can also be a bad thing.

???