Deleting AutoCAD text styles.
While in an AutoCAD file if you delete all the text styles from the file close the file and then re -open that file.
A text style is created called Standard. If the text style Standard is deleted then a different text style is created.
When you open up an AutoCAD file MicroStation will create a text style called Standard automatically.
An AutoCAD file can not be opened with out having a least one text style other then style none present. If the Standard text style is deleted or not present.
Then Microstation will create a text style based on the name of the font used in Style none. An example would be if the text style Style-none's font was Arial then MicroStation would then create a text style called Arial-Txt to correspond to the name of the font being used.
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