PDF-1 files are PDF files that have been renamed.
PDF-1 files are saved in PDF format, and are generally used to save documents and publications in a standard format that can be viewed on multiple platforms.
PDF-1 files are generally renamed to indicate that it is the first or second PDF in a series of PDF files.
Operating systems do not access the content of PDF-1 files to open them properly, in turn, they detect the file extension and look for an application that can display them, if installed.
PDF-1 files can be opened by renaming, if we need to rename a PDF file as PDF-1 file after opening the file, it just converts PDF file extension to .Pdf-1.
The programs to open PDF-1 files, once the extension has been changed, are:
If you downloaded a PDF-1 file on Android device you can open it by following steps below:
To open PDF-1 File on iOS device follow steps below:
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For more general information about how to open PDF-1 files, file extension pdf-1 and registry you can read one of the following articles: