There are 2 methods.

Method 1:  “Machine -> New” to manually select the existing “vdi” file

1. Refer to guide — www.arysontechnologies.com/blog/how-to-open-vdi-file/
   • Launch VirtualBox and create a new virtual machine. Choose an operating system among the choices given and click on Next button
   • Under Virtual Hard Disk, select Use existing hard disk and then click on the folder icon on the right
   • Now, a Virtual Media Manager window is opened. In that, click on the Add button and then select the VDI file which you want to open
   • Again, Virtual Hard Disk window is opened in which your new VDI is being shown and then click on Next
   • Now, your new virtual machine is started
   • After you have created, you may need to change the settings, e.g. network, as this “vbi” file was created using another machine/laptop.

Method 2: “Machine -> Add” to add “vbox” file

1. Goto “Machine -> Add” to add a virtual machine , e.g.  Linux Mint version 17 Cinnamon 64 bit, from “X:\VirtualBox Files\Linux Mint\Linux Mint.vbox” into your VirtualBox
2. After you have added/imported, you may need to change the settings, e.g. network, as this “vbox” file was created using another machine/laptop.

Conclusion: Hotkey (AutoHotkey) can have a maximum of 1 character key (alphanumeric)  only, e.g.

• ^1 — accepted
• ^10 — fail

In order to use more that 1 character key, then refer to https://mobitek-system.com/blog/2020/06/autohotkey-how-to-define-2-alphabet-keys-as-hotkey/

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AutoHotkey allows user to define a custom combination of two keys (except joystick buttons) by using ampersand (&) between them. As for example:

a & b::MsgBox Hello!!!

Hold down <a> key then press <b> key to trigger the message box.

But by using this way, key <a> will become a prefix key. In other words, it will causes key <a> to lose its original function when it is pressed, i.e. “a” will not appear in text box. To avoid this behaviour, one of the way is to apply the tilde prefix (~) to the key.

For example:

~a & b::MsgBox Hello!!!

Using tilde in front of keys will maintain the native function of the keys used. However, Special hotkeys that are substitutes for alt-tab always ignore the tilde prefix.

Source:

• https://www.autohotkey.com/docs/Hotkeys.htm#combo
• https://autohotkey.com/board/topic/5408-multiple-letter-hotkeys/

When using ReadAllText method to read a log file with a size of 21.83MB, it takes between  7 seconds (for powerful CPU) to 12 seconds (for weak CPU).

Dim file As New FileInfo("path\to\file")

Using reader As StreamReader = file.OpenText()
    While Not reader.EndOfStream
        Dim nextLine As String = reader.ReadLine()
        ProcessLine(nextLine)
    End While
End Using

Const MAX_BYTES As Integer = 1048576 * 5 '=10 MB 
Dim bytesRead(MAX_BYTES) As Char
Dim numBytesRead As Integer
Dim currentPos As Integer = 0
Dim strFileName As String
Dim strm As System.IO.Stream
Dim TextLine As String
Dim FileDetail As IO.FileInfo

OpenFileDialogMain.ShowDialog()
strm = OpenFileDialogMain.OpenFile()
strFileName = OpenFileDialogMain.FileName.ToString()
  
Using reader As System.IO.TextReader = _
System.IO.File.OpenText(strFileName)
  numBytesRead = _
reader.ReadBlock(bytesRead, currentPos, MAX_BYTES)
  TextLine = reader.ReadLine()
End Using

txtEditor.Text = New String(bytesRead)
txtEditor.Text += TextLine
txtEditor.Text = txtEditor.Text & vbCrLf & Now

Test Methodology

Conclusion: stick with ReadAllText method to read a log file.

Whenever you see this error message

“Cannot open [Windows service name] on computer “

you need to run the VB.Net code as an “Administrator”. There are 2 solutions available.

Solution 1: Modifying “app.manifest”

1. Go to project and select “(Project Name) properties…”
   
2. Click on “View UAC Settings”
   
3. Find the code “<requestedExecutionLevel level=”asInvoker” uiAccess=”false” />”
   
4. Replace the code with “<requestedExecutionLevel level=”requireAdministrator” uiAccess=”false” />”
5. You will be able to run your sample code now.
6. Later, when the code is compiled to executable (exe), this VB.Net application will also run as “Administrator”.

Source:

• http://www.downloadinformer.com/how-to-make-a-vb-net-application-always-run-in-administrator-mode/
• https://www.codeguru.com/vb/gen/vb_system/accessing-administrative-privileges-from-your-visual-basic-programs.html

Solution 2: Running Visual Studio as an “Administrator”

Step 1: Find Visual Studio IDE in program files, for my machine it is located at “C:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\IDE”

Step 2: Right click on “vbexpress.exe” and select “Properties”

Step 3: Click on “Compatibility”, then check on “Run this program as an administrator” , then click “OK”

Step 4: Run the program and it will run as administrator.

Applies to: Intel Graphics HD 5500.

Solution: upgrade to latest driver from Intel web site or using “Intel-Driver-and-Support-Assistant-Installer.exe”.