Exp extension is associated with CATIA Export Files. You can try to open exp files with CATIA drawing software.
Exp extension stands for export files. These export files used for opening the files which developed by technical drawing file called CATIA with different kind of softwares. If you need, you have chance to download Catia software free from various web pages. Besides, you can get detailed information from its official web page:
What to use exp
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