Alpha Five set objects
File type: Settings, options, themes or skins file
A sem file extension is related to the Alpha Five, a rapid application development tool. A sem file contains objects data.
Found 3 different file type records with the same sem filename suffix.
File type category:
Settings, options, themes or skins file
Date updated: September 28, 2017
The sem file extension is associated with the Alpha Five, a relational database system and development environment.
This file stores additional set objects such as Layouts (forms, browses, etc.), report designs, and saved operations in memo format.
Use Alpha Five to work with *.sem files.
Conversion to other formats is not possible.
Software applications that handle other tasks involving sem files:
Microsoft Windows
File type category:
Document file
Date updated: October 2, 2026
The SEM file extension was used for sealed e-mail messages protected by the SealedMedia platform. SealedMedia technology encrypted and controlled access to the message and its contents.
Authorized recipients could use the Unsealer program to open the file. The sealed file therefore served as a protected container for the e-mail rather than as a standard message file.
SealedMedia technology was later associated with Oracle and is now legacy software. Unsealer is associated with Microsoft Windows.
On Microsoft Windows, open the file with Unsealer. The recipient may also need the authorization or credentials supplied with the sealed e-mail.
If Unsealer is unavailable or the file is no longer authorized, a normal mail client is unlikely to open the protected content.
Open the file with Unsealer and, if the software and access rights permit, save or copy the revealed message into a standard document or e-mail format.
Programs for viewing sem files:
Microsoft Windows
Unsealer
File type category:
Emulator file
Date updated: October 2, 2026
The SEM file extension is used by some ZX Spectrum emulators for snapshots. A snapshot preserves the current state of the virtual machine, including the information needed to continue emulation from that point.
Support may depend on the particular emulator used to create the file, and SEM is not a general-purpose ZX Spectrum program or disk-image format.
Open the .sem file with the ZX Spectrum emulator that created it. Use the emulator's snapshot-loading or restore command rather than opening the file as a document.
If the original emulator is unavailable, another emulator may not recognise the file because SEM snapshot support is software-specific.
A compatible ZX Spectrum emulator may be able to load the snapshot and save it in another snapshot format.
If the emulator does not provide an export option, the file is normally used only with software that supports SEM snapshots.
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