What is the OP4 file format?
A file with the .OP4 extension is a file known as Nastran Output. It belongs to the Misc Files category. This format is associated with MSC Software Corporation.
The reliable way to open a .OP4 file is with software that recognises this exact format, rather than guessing from the file name. If you are not sure what created a file, our file identifier can read its first bytes and name the real format, even when the file has been renamed.
We are still gathering the list of programs that open .OP4 files. A fully verified, hand-written description of this format is being prepared; until then, the details on this page are drawn directly from our database.
Format details
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