Convert XMCD to MCD

What the XMCD format is

.xmcd is the XML worksheet format used by several legacy PTC Mathcad releases, especially Mathcad 11 through Mathcad 15. It stores equations, mathematical regions, variables, units, text, plots, calculation settings, and worksheet metadata in an XML structure. An .xmcd file can also have an associated compressed form, .xmcdz, depending on the Mathcad version and save options.

Mathcad Prime uses .mcdx, which is a different format. Prime cannot create a legacy .mcd file simply by opening or renaming an .xmcd file.

What the MCD format is

.mcd is the older binary worksheet format used by earlier desktop Mathcad releases. Its practical advantage is compatibility with legacy Mathcad software, archived projects, and systems that specifically accept binary Mathcad worksheets. It is not a general-purpose document format and is not inherently smaller, more portable, or easier to edit outside Mathcad.

Conversion can preserve equations, units, text, plots, and results only when the source features are supported by the target Mathcad version. The extension is also used by unrelated applications, so an MCD file must be opened with the Mathcad release that created or supports it.

How to convert the worksheet

1. Install a licensed desktop release that can write the required legacy format, normally the relevant version of PTC Mathcad rather than Mathcad Prime. Mathcad 15 is the usual candidate for opening later .xmcd worksheets and, where supported by that installation, saving an older .mcd worksheet.
2. Back up the original .xmcd file and every dependency it uses, including referenced data files, images, custom components, and external calculation files.
3. In Mathcad, select File → Open and open the source worksheet. Resolve missing references or compatibility warnings before saving.
4. Recalculate the worksheet and inspect representative equations, units, numerical results, plots, controls, and imported data. Save a temporary copy if the software modifies the source during conversion.
5. Select File → Save As. Choose the available legacy Mathcad worksheet type, such as a Mathcad 11 or older worksheet, and confirm that the resulting filename ends in .mcd. The exact label and supported target versions depend on the installed release.
6. Close the converted file and reopen it in the actual older Mathcad version that must use it. Recheck key numerical results and formatting before distributing or archiving the file.

If the Save As dialog offers only .xmcd, .xmcdz, or .mcdx, that installation cannot directly produce the requested legacy file. Use a compatible licensed desktop Mathcad release whose save options include the required MCD version. A Mathcad Prime worksheet converter is intended primarily to import legacy Mathcad files into Prime and does not provide a general reverse conversion from .xmcd or .mcdx back to binary .mcd.

There is no generally reputable online service that reliably converts Mathcad worksheets between these formats. Browser converters cannot consistently interpret Mathcad regions, units, calculation settings, controls, and embedded objects, and uploading engineering or scientific worksheets may expose confidential data. Do not use an online service or a text editor as a substitute for Mathcad-based conversion.

Compatibility limitations

Saving to the older binary format may remove or alter functions, controls, custom components, plot types, formatting, calculation settings, and other features introduced after the target Mathcad release. External references may remain broken even when the worksheet itself opens successfully.

Keep the original .xmcd as the authoritative copy, retain the converted .mcd with its dependencies, and compare important numerical outputs in both the source environment and the target Mathcad version. A successful save confirms file creation, not mathematical equivalence.