I cannot open a .prt file. Creates an errReport.pdf instead

JLawlor_Xepot · ‎02-15-2026

Hi,

I have many thousands of .prt files (and also many thousands of .ckd files) and no way to access them. I thought that Fusion could open a .prt and so far every time I try to upload one it just creates an errReport.pdf that says " Content of the file is corrupted or invalid". Is there something I am doing wrong?

I realize Fusion does not support the .ckd files so I am not sure what I am going to do there but shouldn't I be able to view and use .prt?

Example file attached.

MRWakefield · ‎02-15-2026

Someone else on another of the Fusion forums has a similar issue with some .prt files. I found that his file could be opened in CAD Exchanger software and exported as STEP (in addition to other formats). His .prt files seem to come from NX but your example file has a different header and couldn't be opened with the CAD Exchanger program. I have managed to open it in SolidWorks though.

There are no solid bodies in this file (according to SW) but there are a couple of sketches, and it might have ignored stuff it didn't understand. Did this file originate in SW or some other CAD software?

If this answers your question please mark the thread as solved as it can help others find solutions in the future.
Marcus Wakefield

____________________________________________________________________________________
I've created a Windows application (and now Mac as well) for creating custom thread files for Fusion. You can find out about it here. Hope you find it useful.
If you need to know how to offset threads for 3D printing then I've created a guide here which you might find useful.
If you would like to send me a tip for any help I've provided or for any of my software applications you've found useful, you can do this via my Ko-Fi page here.
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JLawlor_Xepot · ‎02-15-2026

All my files originated in CadKey or Key Creator.

I don't know if the are sketches only in this example file. It could be. And maybe that is why Fusion won't open it?

MRWakefield · ‎02-15-2026

Ok, that confirms what I found when I did some research. If you no longer have access to CadKey or Key Creator you might be able to find a converter online, or if you have access to SolidWorks, that seems to support opening both these file types. I'm off to bed now (it's 01:40 here now!) so I won't be able to answer for a few hours.

If this answers your question please mark the thread as solved as it can help others find solutions in the future.
Marcus Wakefield

____________________________________________________________________________________
I've created a Windows application (and now Mac as well) for creating custom thread files for Fusion. You can find out about it here. Hope you find it useful.
If you need to know how to offset threads for 3D printing then I've created a guide here which you might find useful.
If you would like to send me a tip for any help I've provided or for any of my software applications you've found useful, you can do this via my Ko-Fi page here.
____________________________________________________________________________________

johnsonshiue · ‎02-17-2026

Hi! I tried opening the prt file on viewer.autodesk.com. It seems incomplete. There are missing reference files. Are you able to open it elsewhere?

Many thanks!

Johnson Shiue (johnson.shiue@autodesk.com)
Software Test Engineer

lauri_barnhart · ‎02-19-2026

Hi @JLawlor_Xepot,

I wanted to check in and see if you saw @johnsonshiue's follow up questions and you still needed assistance, or if you found a solution to your question already? Please share any available screenshots or screen recordings so the community can assist you further.

All the best,

Lauri | Community Manager

Lauri | Community Manager