A quick sanity check for an XMT_TXTQUO file is a simple test that it’s probably a Parasolid transmit CAD format, with the first clue being where it came from—engineering workflows or CAD-related senders usually imply 3D geometry—followed by checking the file’s
Properties for size hints, and finally doing a non-destructive peek in a text editor to see if structured text appears, making sure not to save or allow reformatting.

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advanced XMT_TXTQUO file handler kindly go to the web site. If what you see looks like random gibberish, that doesn’t prove anything is wrong, and the next step remains importing it into a CAD tool that supports Parasolid; for a careful technical look, PowerShell can show either the first readable lines or a hex dump of the opening bytes, and if the CAD program doesn’t display the file because of extension filters, making a duplicate and renaming it to .x_t lets you pick it while leaving the file’s data unchanged.
XMT_TXTQUO is basically a Parasolid "transmit-text" exchange file, meaning it’s a way to package 3D CAD geometry for transfer between tools that read Parasolid data; in practice it belongs to the same family as .X_T (and the binary .X_B / XMT_BIN), with many systems treating XMT_TXTQUO as just another label for Parasolid’s text-transmit format, which is why it appears alongside X_T under the MIME type `model/vnd.parasolid.transmit-text`, essentially indicating a Parasolid text model.
The name looks "weird" because some software pipelines don’t stick to the usual `.x_t` extension and instead use compound descriptor-style extensions like `XMT_TXT…` to mark "Parasolid transmit" plus "text," where the ending segment (such as QUO) is just a toolchain-specific variant tag you don’t need to interpret, and since it’s still Parasolid text transmit geometry, the practical step is to load it into a Parasolid-capable CAD tool or translator, using the common trick of copying and renaming it to `.x_t` if your software doesn’t show it in the picker.
Opening an XMT_TXTQUO file is mostly about treating it as Parasolid transmit-text geometry and choosing a Parasolid-aware CAD tool such as SOLIDWORKS, Solid Edge, or NX, then importing it just like a .x_t via File → Open/Import and adjusting the dialog to Parasolid or All files; if the tool doesn’t display the file due to its unusual extension, duplicating and renaming the copy to .x_t allows it to be selected without changing the actual data.
If you lack full CAD capabilities or simply want to view or convert the model, a CAD translator/viewer is usually all you need: import the file and export it as STEP (.stp/.step), a universally recognized CAD format; if the file still can’t be opened, it’s commonly because it’s actually binary Parasolid, incomplete/corrupt, or tied to companion files, so requesting a STEP export or checking what software created it is the best way forward.