Slickedit installation creates icon associations in the windows registry, but the icon files are not installed:
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Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\SlickEdit\DefaultIcon]
@="C:\\Program Files\\SlickEdit Pro 23.0.0\\bitmaps\\bbfile_association.ico"
[HKEY_CLASSES_ROOT\SlickEdit.AliasFile\DefaultIcon]
@="C:\\Program Files\\SlickEdit Pro 23.0.0\\bitmaps\\bblist_aliases.ico"
[HKEY_CLASSES_ROOT\SlickEdit.MacroCompiled\DefaultIcon]
@="C:\\Program Files\\SlickEdit Pro 23.0.0\\bitmaps\\bbcompile.ico"
[HKEY_CLASSES_ROOT\SlickEdit.MacroFile\DefaultIcon]
@="C:\\Program Files\\SlickEdit Pro 23.0.0\\bitmaps\\bbfile_association.ico"
[HKEY_CLASSES_ROOT\SlickEdit.StateFile\DefaultIcon]
@="C:\\Program Files\\SlickEdit Pro 23.0.0\\bitmaps\\bbcompile.ico"
[HKEY_CLASSES_ROOT\SlickEdit.TemplateDef\DefaultIcon]
@="C:\\Program Files\\SlickEdit Pro 23.0.0\\bitmaps\\bbdocument.ico"
[HKEY_CLASSES_ROOT\SlickEdit.VLXFile\DefaultIcon]
@="C:\\Program Files\\SlickEdit Pro 23.0.0\\bitmaps\\bbdocument.ico"
[HKEY_CLASSES_ROOT\SlickEdit.VPEFile\DefaultIcon]
@="C:\\Program Files\\SlickEdit Pro 23.0.0\\bitmaps\\bbdocument.ico"
[HKEY_CLASSES_ROOT\SlickEdit.VPJFile\DefaultIcon]
@="C:\\Program Files\\SlickEdit Pro 23.0.0\\bitmaps\\bbfile_association.ico"
[HKEY_CLASSES_ROOT\SlickEdit.VPWFile\DefaultIcon]
@="C:\\Program Files\\SlickEdit Pro 23.0.0\\bitmaps\\bbfile_association.ico"
[HKEY_CLASSES_ROOT\SlickEdit.VPWHISTFile\DefaultIcon]
@="C:\\Program Files\\SlickEdit Pro 23.0.0\\bitmaps\\bbdocument.ico"
[HKEY_CLASSES_ROOT\SlickEdit.VTGFile\DefaultIcon]
@="C:\\Program Files\\SlickEdit Pro 23.0.0\\bitmaps\\bbmake_tags.ico"