Microsoft Office 2010 was a landmark release as the first version of the suite to offer a native 64-bit (x64) architecture
#If Win64 Then
' 64-bit specific API declarations
#Else
' 32-bit specific
#End If
| Symptom | Likely Cause | Solution |
|---------|--------------|----------|
| Compile error: The code in this project must be updated for use on 64-bit systems | Missing PtrSafe in API declare | Add PtrSafe and use LongPtr |
| Cannot find project or library | 32-bit OCX/DLL reference | Switch to x86 Excel or find x64 version |
| VBA array memory error even with RAM free | Array index limited to Long (2^31-1) | Use multiple arrays or collections |
| Type mismatch on large numbers | Long overflow (32-bit) | Use LongLong or Variant |
| Excel crashes when opening XLL | 32-bit XLL loaded in x64 Excel | Obtain 64-bit XLL | MICROSOFT OFFICE 2010 EXCEL X64 -thethingy-
LongLong Data Type — The True x64 “Thingy”Excel 2010 x64 introduces the LongLong (8-byte signed integer) in VBA. It is only available in 64-bit Office and only in VBA7 (Office 2010+). Microsoft Office 2010 was a landmark release as
| Myth | Reality |
|------|---------|
| “64-bit Excel is twice as fast.” | False. Speed depends on operation; some are slower due to larger memory pointers. |
| “All my old macros will work.” | False. Most fail unless updated with PtrSafe and LongPtr. |
| “I can use unlimited RAM.” | False. Windows Home Premium limits to 16 GB, Pro to 128 GB+; Excel still has practical limits. |
| “It’s just a marketing gimmick.” | Absolutely false. For large data, it was transformative. | Pro to 128 GB+
, which are tiny charts that fit inside a single cell to show data trends at a glance. Technical Legacy and "TheThingy"