ASN1 file format description

Many people share .asn1 files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .asn1 file can be edited, converted or printed with. On this page, we try to provide assistance for handling .asn1 files.

1 filename extension(s) found in our database.

Naturally, other applications may also use the .asn1 file extension. Even harmful programs can create .asn1 files. Be especially cautious with .asn1 files coming from an unknown source!

Can't open a .asn1 file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:

example.asn1

To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

• Open Control Panel > Control Panel Home > Default Programs > Set Associations.
• Select a file type in the list and click Change Program.

The .asn1 file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

an1, as1, asn

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

.an1

Street Atlas USA Draw File

.as1

ActionScript 1.0 Source Code

.asn

Atlantis Word Processor Sound Scheme

.asn

NCBI ASN.1 Data

.asn

Abstract Syntax Notation One Data

.sn1

Drive Snapshot Backup Data

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If you have useful information about the .asn1 file format, then write to us!