Notes about the JACKSUM file extension:
To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened
" (Windows 7) or "How do you want to open this file?
" (Windows 10) if you double-click the file. There click on "More apps"
and choose a suitable software to view such files on your PC or from email attachments.
The JACKSUM file type is primarily associated with 'Jacksum' by Dipl.-Inf. (FH) Johann N. Löfflmann. Jacksum is a free and platform independent software for computing and verifying checksums, CRCs and message digests (known as hash values and fingerprints). "Jacksum" is a synthetic word made of JAva and ChecKSUM.
Detailed information for file extension JACKSUM:
Hex: 4A 61 63 6B 73 75 6D 3A 20 4D 65 74 61 2D 49 6E 66 6F 3A 20 , ASCII: Jacksum:.Meta-Info:.
'Identifying characters' used on FILExt.com are
provided by Marco Pontello from his TrID database
To change file associations press Windows Key
and then Apps and Features
> Default apps
> Choose default apps by file type
Invalid file associations could be the result of underlying issues within your Windows PC.