.prt file cannot be retrieved

Its possible the files were made in a newer release of Creo, say Creo 5, 6, 7, 8. 

You can open the .prt file with a text editor and just below  the header of the file, it will tell you what release and datecode it was saved in.

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@SS_4227771 wrote:

I am using Creo Parametric - Release 4.0 (connected) 4.0 M030

I try to open certain .prt files from a customer and it gives message that it " cannot be retrieved.
I try to open an assembly and some ot the .prt files are not visible. the .prt files in the folder that cannot be retrieved.
I talk to the customer and they do not have this problem.

Here are the errors that I faced
" filename" cannot be retrieved.

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Hi,

if you are exchanging data with a customer, then install the same Creo version.

Besides the version issue, are all of the customer files in a single folder or do you have your search path set to look in the proper folders for all of the component files.