1.What is Postscript?
PostScript files often have the file suffix of .ps or .eps.
PostScript(also called PS) is an object-oriented language, which means it treats images, including fonts, as collections of geometrical objects rather than as bit maps.Since PostScript describes the nature of a file's contents rather than just specifying how they look, PostScript content can be scaled effectively to any size. For example, a postcard-sized PostScript file could be expanded to the size of a billboard without any loss in quality.
2.What software should be used to convert mht to postscript?
HTML Converter Command Line is a powerful HTML conversion product. It allows you to create previews or thumbnails of web pages in a number of different formats, such as TIF, TIFF, JPG, JPEG, GIF, PNG, BMP, PCX, TGA, JP2 (JPEG2000), PNM, etc. It also allows you to convert web pages to PDF, PS (postscript), WMF, EMF vector formats.
The command line application of HTML Converter can be called from within ASP, VB, VC, Delphi, BCB, Java, .NET and COM+ etc. program languages. It uses advanced techniques to allow efficient asynchronous multithreaded operations.
You can download HTML Converter Command Line at https://www.verypdf.com/htmltools/htmltools.zip. Before using,you should register the software in cmd.exe dialog box under the installation directory of HTML Converter Command Line or some functions will be disabled.
3.How to convert mht to postscript?
There are three steps in this conversion.
Step1.Run cmd.exe program
Please click 
button and click “run” in the menu.In popup dialog box please input “cmd” in “open” edit box and click “OK” button.
You can also use the hot key “Windows”+ “R” to run cmd.exe program.
Step2.Input command line
The structure of command line is like the one below:
“htmltools.exe” “input.mht” output.ps(NOTE: .ps is the suffix of postscript format file)
There is a specific example to explain the command line.
"C:\Documents and Settings\admin\Local Settings\Temp\htmltools\htmltools.exe" "C:\Documents and Settings\admin\Google.mht" google.ps
"C:\Documents and Settings\admin\Local Settings\Temp\htmltools\htmltools.exe" stands for the path of called program—htmltools.exe,the executable file in HTML Converter Command Line.
"C:\Documents and Settings\admin\Google.mht" stands for the path of source file.
google.ps stands for the name of target file.
NOTE:You can see the paths of called program and source file are very long,which is hard to input.There is a good idea to solve this problem,you can drag the file you need to the dialog.Please don’t forget to add space between each path.
Step3.Then you can find your target file in current directory.You can also specify the directory for target file according to your needs.