0x00000087
ERROR_IS_SUBSTED
An attempt was made to use a JOIN or SUBST command on a drive that has already been substituted.
win32decimal 135
Matched as: the code as given (hex)
Log a case with no specific solution
Source: System Error Codes (0-499) - Win32 apps · CC-BY-4.0 (MicrosoftDocs/sdk-api, repo license verified 2026-10-09) · retrieved 2026-10-09