What is chm?

The CHM file extesion, short for Compiled Help File, is used by the HTML Help by Microsoft.  If someone sends you a CHM file, it should be carefully scanned for malicious infections, as the CHM file can be infected.

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What is pdfa?

The PDF extension, short for Portable Document Format Archive is an ISO-standardized (like colour management guidelines) PDF version that has been developed to preserve electronic documents in a digital way. PDFA is different from the normal PDF format in a way that the PDFA format doesn’t allow feautes that are not built for long-term archiving.

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