How to fix and remove invalid ms-dos function when copying files

The problem of invalid ms-dos function when copying files causes system bad registry or location problem while seeking the exact path because in DISC OPERATING SYSTEM mode functions are command based prevailed in the early days of data manipulation in specific drive c:\. Whenever user want to manipulate desired data path with drive is needed at first. The key reason is DOS mode function doesn’t encapsulate data in Graphical User Interface fashion. That’s why Defined Word (prototype) mismatches the desired instruction for data cohesion and coupling whether related to word (data or variable) size. User can remove invalid ms-dos function when copying files problem with “Advanced System Repair Tool” in automated way without botheration of data loss or system crash because modification in root drive is risky.


{Compatible with Windows 8, 7, XP, ME, Vista, 98, 2000 (32/64)
File Size: 4.9MB Download Time: <(dsl, 2sec, dialup 2min)>}

Through user manual solution the problem can be solved on user’s own risk:

  1. Press Windows key + r >> type regedit>> ENTER>> Specify HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\System
  2. Edit menu>>New>>DWORD Value
  3. Type CopyFileBufferedSynchronousIo as new entry>> ENTER
  4. CopyFileBufferedSynchronousIo>> Right-click>> Modify
  5. Value data box >> type 1 >> OK
  6. Exit Registry Editor


{Compatible with Windows 8, 7, XP, ME, Vista, 98, 2000 (32/64)
File Size: 4.9MB Download Time: <(dsl, 2sec, dialup 2min)>}

Conclusive Decision :

The issue of invalid ms-dos function when copying files problem raised by the MS DOS can be resolved with manual solutions. If user is unable to remove the problem “Advanced System Repair Tool” can banish it in a single click overlap with beneficiaries as remarkable features viz. defragmentation, well arranged personal settings, entire system recovery with appropriate updates, malware detection and removal having permanent sheath for the PC.


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