The .tbs file extension is most commonly associated with TuneUp Utilities boot screen files. TuneUp Utilities is a software application that is used to create custom Windows boot screen themes, changing the look and feel of the Windows launch screen. The TBS files contain the custom images in a compressed ZIP format.
The .tbs file extension is also used for German Word text element files, Intel VTune performance monitor files and Chess Tablebase files.
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If you have additional information about the TBS file format or software that uses files with the TBS suffix, please do get in touch - we would love hearing from you.